mpqc (1) - Linux Manuals
mpqc: The Massively Parallel Quantum Chemistry program (MPQC) computes the properties of molecules from first principles.
NAME
mpqc - The Massively Parallel Quantum Chemistry program (MPQC) computes the properties of molecules from first principles.
This documentation is divided into the following chapters:
- o
- MPQC Overview
- o
- Running MPQC
- o
- MPQC Input
- o
- Validating MPQC
- o
- Running Psi 3 from MPQC
- o
- CCA Components
- o
- MPQC License
- o
- MPQC Warranty
MPQC Overview
The Massively Parallel Quantum Chemistry program (MPQC) computes the properties of molecules, ab initio, on a wide variety of computer architectures.
MPQC can compute closed shell and general restricted open-shell Hartree-Fock energies and gradients, second order open-shell perturbation theory (OPT2[2]) and Z-averaged perturbation theory (ZAPT2) energies, and second order closed shell Moeller-Plesset perturbation theory energies and gradients. It also includes methods for optimizing molecules in either Cartesian or internal coordinates.
MPQC is designed using object-oriented programming techniques and implemented in the C++ programming language.
Running MPQC
This chapter explains how to run MPQC in a variety of environments.
The first two sections give general information on running MPQC:
- o
- Command Line Options
- o
- Environmental Variables
The final sections given specific information on running MPQC in different environments:
- o
- Shared Memory Multiprocessor with SysV IPC
- o
- Shared Memory Multiprocessor with POSIX Threads
- o
- Shared or Distributed Memory Multiprocessor with MPI
- o
- Special Notes for MP2 Gradients
- o
- Special Notes for MP2-R12 energies
- o
- Special Notes for CCA Components
Command Line Options
MPQC can be given options followed by an optional input file name. If the input file name is not given, it will default to 'mpqc.in'. The following command line options are recognized:
- -o
- Gives the name of the output file. The default is the console.
- -i
- Convert a simple input file to an object oriented input file and write the result to the ouput. No calculations are done.
- -messagegrp
- A ParsedKeyVal specification of a MessageGrp object. The default depends on how MPQC was compiled.
- -memorygrp
- A ParsedKeyVal specification of a MemoryGrp object. The default depends on how MPQC was compiled.
- -threadgrp
- A ParsedKeyVal specification of a ThreadGrp object. The default depends on how MPQC was compiled.
- -integral
- A ParsedKeyVal specification of an Integral object. The default is IntegralV3. Note that some MolecularEnergy specializations require specific choices of Integral specializations and may not work with IntegralV3.
- -l
- Sets a limit on the number of basis functions. The default is zero, which means an unlimited number of basis functions.
- -W
- Sets the working directory. The default is the current directory.
- -c
- Check the input and exit.
- -v
- Print the version number.
- -w
- Print the warranty information (there is no warranty).
- -d
- If a debugger object was given in the input, start the debugger running as soon as MPQC is started.
- -h
- Print a list of options.
- -f
- The name of an object-oriented input file. The default is mpqc.in. This cannot be used if another input file is specified. This option is deprecated, as both input file formats can be read by given the input file name on the command line without any option flags.
- -cca-path
- A colon-separated list of directories in which CCA component libraries may be found.
- -cca-load
- A colon-separated list of sidl class names for CCA components which will be instantiated from the libraries found in the path given by -cca-path
Some MPI environments do not pass the command line to slave programs, but supply it when MPI_Init is called. To make MPQC call MPI_Init with the correct arguments as early as possible use the configure option --enable-always-use-mpi.
Environmental Variables
MPQC looks at five environmental variables to set up communication, find library files, and specify the default Integral object. Machine specific libraries and utilities to run programs in parallel might look at other environment variables as well. The five that apply on all platforms are:
- SCLIBDIR
- The name of the library directory. See the GaussianBasisSet documentation and look below for more information.
- MESSAGEGRP
- A ParsedKeyVal specification of a MessageGrp object. The default depends on how MPQC was compiled. See the MessageGrp class documentation for more information.
- MEMORYGRP
- A ParsedKeyVal specification of a MemoryGrp object. The default depends on how MPQC was compiled and the MessageGrp in use.
- THREADGRP
- A ParsedKeyVal specification of a ThreadGrp object. The default depends on how MPQC was compiled.
- INTEGRAL
- A ParsedKeyVal specification of an Integral object. The default is IntegralV3. Note that some MolecularEnergy specializations require specific choices of Integral specializations and may not work with IntegralV3.
By default, MPQC tries to find library files first in the lib subdirectory of the installation directory and then the source code directory. If the library files cannot be found, MPQC must be notified of the new location with the environmental variable SCLIBDIR.
For example, if you need to run MPQC on a machine that doesn't have the source code distribution in the same place as it was located on the machine on which MPQC is compiled you must do something like the following on the machine with the source code:
cd mpqc/lib tar cvf ../sclib.tar basis atominfo.kv
Then transfer sclib.tar to the machine on which you want to run MPQC and do something like
mkdir ~/sclib cd ~/sclib tar xvf ../sclib.tar setenv SCLIBDIR ~/sclib
The setenv command is specific to the C-shell. You will need to do what is appropriate for your shell.
The other three keywords specify objects. This is done by giving a mini ParsedKeyVal input in a string. The object is anonymous, that is, no keyword is associated with it. Here is an example:
setenv MESSAGEGRP '<ShmMessageGrp>:(n = 4)'
Shared Memory Multiprocessor with SysV IPC
By default, MPQC will run on only one CPU. To specify more, you can give a ShmMessageGrp object on the command line. The following would run MPQC in four processes:
mpqc -messagegrp '<ShmMessageGrp>:(n = 4)' input_file
Alternately, the ShmMessageGrp object can be given as an environmental variable:
setenv MESSAGEGRP '<ShmMessageGrp>:(n = 4)' mpqc input_file
If MPQC should unexpectedly die, shared memory segments and semaphores will be left on the machine. These should be promptly cleaned up or other jobs may be prevented from running successfully. To see if you have any of these resources allocated, use the ipcs command. The output will look something like:
IPC status from /dev/kmem as of Wed Mar 13 14:42:18 1996 T ID KEY MODE OWNER GROUP Message Queues: Shared Memory: m 288800 0x00000000 --rw------- cljanss user Semaphores: s 390 0x00000000 --ra------- cljanss user s 391 0x00000000 --ra------- cljanss user
To remove the IPC resources used by cljanss in the above example on IRIX, type:
ipcrm -m 288800 ipcrm -s 390 ipcrm -s 391
And on Linux, type:
ipcrm shm 288800 ipcrm sem 390 ipcrm sem 391
Shared Memory Multiprocessor with POSIX Threads
By default, MPQC will run with only one thread. To specify more, you can give a PthreadThreadGrp object on the command line. MPQC is not parallelized to as large an extent with threads as it is with the more conventional distributed memory model, so you might not get the best performance using this technique. On the other the memory overhead is lower and no interprocess communication is needed.The following would run MPQC in four threads:
mpqc -threadgrp '<PthreadThreadGrp>:(num_threads = 4)' input_file
Alternately, the PthreadThreadGrp object can be given as an environmental variable:
setenv THREADGRP '<PthreadThreadGrp>:(num_threads = 4)' mpqc input_file
Shared or Distributed Memory Multiprocessor with MPI
A MPIMessageGrp object is used to run using MPI. The number of nodes used is determined by the MPI run-time and is not specified as input data to MPIMessageGrp.
mpqc -messagegrp '<MPIMessageGrp>:()' input_file
Alternately, the MPIMessageGrp object can be given as an environmental variable:
setenv MESSAGEGRP '<MPIMessageGrp>:()' mpqc input_file
Usually, a special command is needed to start MPI jobs; typically it is named mpirun.
Special Notes for MP2 Gradients
The MP2 gradient algorithm uses MemoryGrp object to access distributed shared memory. The MTMPIMemoryGrp class is the most efficient and reliable implementation of MemoryGrp. It requires a multi-thread aware MPI implementation, which is still not common. To run MP2 gradients on a machine with POSIX threads and an multi-thread aware MPI, use:
mpqc -messagegrp '<MPIMessageGrp>:()' \
-threadgrp '<PthreadThreadGrp>:()' \
-memorygrp '<MTMPIMemoryGrp>:()' \
input_file
or
setenv MESSAGEGRP '<MPIMessageGrp>:()' setenv THREADGRP '<PthreadThreadGrp>:()' setenv MEMORYGRP '<MTMPIMemoryGrp>:()' mpqc input_file
Special Notes for MP2-R12 energies
Distributed MemoryThe MP2-R12 energy algorithm is similar to the MP2 energy algorithm that uses MemoryGrp object to access distributed memory. Hence the MTMPIMemoryGrp is the recommended implementation of MemoryGrp for such computations (see Special Notes for MP2 Gradients).
Disk I/O
In contrast to the MP2 energy and gradient algorithms, the MP2-R12 energy algorithm may have to use disk to store transformed MO integrals if a single pass through the AO integrals is not possible due to insufficient memory. The best option in such case is to increase the total amount of memory available to the computation by either increasing the number of tasks or the amount of memory per task or both.
When increasing memory further is not possible, the user has to specify which type of disk I/O should be used for the MP2-R12 energy algorithm. It is done through the r12ints keyword in input for the MBPT2_R12 object. The default choice is to use POSIX I/O on the node on which task 0 resides. This kind of disk I/O is guaranteed to work on all parallel machines, provided there's enough disk space on the node. However, this is hardly most efficient on machines with some sort of parallel I/O available. On machines which have an efficient implementation of MPI-IO the r12ints should be set instead to mpi-mem. This will force the MBPT2_R12 object to use MPI-IO for disk I/O. It is user's responsibility to make sure that the MO integrals file resides on an MPI-IO-compatible file system. Hence the r12ints_file keyword, which specifies the name of the MO integrals file, should be set to a location which is guaranteed to work properly with MPI-IO. For example, on IBM SP and other IBM machines which have General Parallel File System (GPFS), the user should set r12ints = mpi-mem and r12ints_file to a file on a GPFS file system.
Integral object
At the moment, MBPT2_R12 objects require specific specialization of Integral, IntegralCints. Thus in order to compute MP2-R12 energies, your version of MPQC needs to be compiled with support for IntegralCints. A free, open-source library called libint is a prerequisite for IntegralCints. In order to use IntegralCints as the default Integral object, add -integral '<IntegralCints>:()' to the command line, or set environmental variable INTEGRAL to '<IntegralCints>:()'.
Special Notes for CCA Components
Common Component Architecture (CCA)Portions of MPQC functionality are being packaged into CCA components. For general overviews of CCA technology and framework usage, please see www.cca-forum.org (the tutorial in particular) and the cca-chem-apps documentation. MPQC components may be utilized directly within the ccaffeine framework, while some components may be instantiated and used within MPQC itself, making use of an embedded CCA framework.
CCA Runtime Environment
For MPQC runs utilizing embedded components, the runtime environment for the CCA framework must be specified. The colon-separated path used to locate component libraries must be specified either using the -cca-path command-line option or using the cca_path key within the mpqc section of a keyval input. The colon-separated list of component sidl class names which will be referenced within the input must be specified using either the -cca-load command-line option or using the cca_load key within the mpqc section of a keyval input. If defaults for the cca-path and cca-load options are desired, do_cca must be set to yes in the keyval input.
MPQC Input
MPQC supports two input formats. The primary input is an object oriented format which gives users access to all of MPQC's options. The second format allows access to a subset of MPQC's capabilities, but is more intuitive and easier to learn. New users are advised to start with the simplified format. MPQC can be used to convert the simplified format to the full object-oriented format with the -i option.
Each of these input formats is described in the following two chapters:
- o
- Simple Input
- o
- Object-Oriented Input
Simple Input
The simple input format consists of keywords followed by a ':' followed by a value. The keywords are case sensitive. The values might be modified by options found in parenthesis. For example, the following input performs an optimization of water using density functional theory with the B3LYP exchange-correlation functional:
% B3LYP optimization of water
optimize: yes
method: KS (xc = B3LYP)
basis: 3-21G*
molecule: (angstrom)
O 0.172 0.000 0.000
H 0.745 0.000 0.754
H 0.745 0.000 -0.754
Comments begin with a % and continue to the end of the line. Basis set names containing special characters, such as a space or parentheses, must be quoted inside a pair of double quotes. The accepted keywords are:
The following options are valid with the KS, RKS, and UKS methods:
The following options are valid with the MP2-R12/A and MP2-R12/A' methods. These options are mutually exclusive:
The following options are valid with the MP2-R12/A' method:
MPQC is an object-oriented program that directly allows the user to specify objects that MPQC then manipulates to obtain energies, properties, etc. This makes the input very flexible, but very complex. However, most calculations should be quite similar to the one of the examples given later in this chapter. The best way to get started is to use one of the example input files and modify it to meet your needs.
The object-oriented input format is described in the following sections:
The keywords recognized by MPQC begin with the mpqc prefix. That is, they must be nested between an mpqc:( and a ). Alternately, each keyword can be individually prefixed by mpqc:. The primary keywords are given below. Some of the keywords specify objects, in which case the object will require more ParsedKeyVal input. These objects are created from the input by using their ParsedKeyVal constructors. These constructors are documented with the source code documentation for the class.
opt object will be checkpointed after each iteration. The checkpoint file suffix is '.ckpt'.
mole object will be checkpointed at intermediate points. The manner in which mole will be checkpointed depends on its particular type. The checkpoint file suffix is usually '.wfn', however in general it will depend on the particular specialization of MolecularEnergy.
The default is to not checkpoint.
There are also some utility keywords that tell mpqc some technical details about how to do the calculation:
We start with a descriptive comment. Comments begin with a %. Everything from the % to the end of the line is ignored.
Now lets set up a Molecule object. The name of the object comes first, it is molecule. Then, in angle brackets, comes the type of the molecule, which is the class Molecule. The keyword and class name are followed by a : and then several pieces of input grouped between a pair of matching parentheses. These parentheses contain the information that will be given to Molecule KeyVal constructor.
The point group of the molecule is needed. This is done by assigning symmetry to a case insensitive Schoenflies symbol that is used to initialize a PointGroup object. An Abelian point group should be used.
The default unit for the Cartesian coordinates is Bohr. You can specify other units by assigned unit to a string that will be used to initialize a Units object.
Finally, the atoms and coordinates are given. This can be given in the shorthand table syntax shown below. The headings of the table are the keywords between the first pair of brackets. These are followed by an = and another pair of brackets that contain the data. The first datum is assigned to the first element of the array that corresponds to the first heading, atom. The second datum is assigned to the first element of the array associated with the second heading, geometry, and so on. Here the second datum is actually a vector: the x, y and z coordinates of the first atom.
Next, a basis set object is given.
Now we will give the main body of input. All the subsequent keywords will be grouped in the mpqc section of the input (that is, each keyword will be prefixed with mpqc:).
Next we give the mole keyword which provides a specialization of the MolecularEnergy class. In this case we will do a closed-shell Hartree-Fock calculation. That is done with an object of type CLHF. The keywords that CLHF accepts are given with the documentation for the CLHF class, usually in the description of the const RefKeyVal& constructor for the class. Also with the CLHF documentation is a list of parent classes. Each of the parent classes may also have input. This input is included with the rest of the input for the child class.
The next line specifies the molecule to be used. There are two things to note, first that this is actually a reference to complete molecule specification elsewhere in the input file. The $ indicates that this is a reference and the keyword following the $ is the actual location of the molecule. The : in front of the keyword means that the keyword is not relative to the current location in the input, but rather relative to the root of the tree of keywords. Thus, this line grabs the molecule that was specified above. The molecule object could have been placed here, but frequently it is necessary that several objects refer to the exact same object and this can only be done using references.
The second point is that if you look at the documentation for CLHF, you will see that it doesn't read molecule keyword. However, if you follow its parent classes up to MolecularEnergy, you'll find that molecule is indeed read.
Just as we gave molecule, specify the basis set with the basis keyword as follows:
Now we close off the parentheses we opened above and we are finished.
By default, the initial fixed coordinates' values are taken from the cartesian geometry given by the Molecule object; however, the molecule will be displaced to the internal coordinate values given with the fixed internal coordinates if have_fixed_values keyword is set to true, as shown in this example. In this case, the initial cartesian geometry should be reasonably close to the desired initial geometry and all of the variable coordinates will be frozen to their original values during the initial displacement.
The mole object will be saved to files named 'h2o-rhf-STO3G.wfn.<iter#>.tmp' where <iter#> is the SCF iteration number (3, 6, etc.). Only the most recent file is kept, files from previous iterations are removed automatically. Keyword filename here is used to set the default file name prefix.
The mole object will be saved to a file named h2o-mp2r12ap-vdz-avdz.wfn. Keyword filename here is used to set the default file name prefix. Objects of the MBPT2_R12 type are checkpointed after the HF procedure, after the first integrals (SBS) transformation, and after the optional second (ABS) transformation.
The second input reuses the mole object from the previous run to compute the gradient of the Hartree-Fock energy.
Note that now object reference is of type SavableStateProxy, rather than CLHF. SavableStateProxy is a special object type that can be converted at runtime into the desired type (in this case, CLHF, as indicated by object).
After you compile MPQC, you should run the validation suite. You should also run the validation suite if you upgrade your operating system software, since this could change shared libraries that are linking with MPQC and could affect the results. Note that the reference validation suite has not been verified relative to an independent code, except for a few spot checks. If you find that MPQC doesn't produce the same answer as another quantum chemistry program that you trust, then please promptly notify us and send all the details.
The top-level Makefile has several targets that can be used to check an MPQC build. MPQC must be built before one of these targets is used:
The check targets will run mpqc with the mpqcrun (see mpqcrun) command. You can give arguments to mpqcrun by setting the MPQCRUN_ARGS variable on the make command line.
The verification suite is in src/bin/mpqc/validate. After running it, the output files can be found in src/bin/mpqc/validate/run. The check targets will compare outputs that your build produced to the reference files in src/bin/mpqc/validate/ref. The input files can be found with the reference files. For each comparison, first the status (ok, missing, or failed) for each file is printed. If both statuses are ok then an E: is printed followed by the number of digits to which the energies agree. If they agree to all digits 99 is printed. If a gradient was computed, then Grad: is printed followed by the number of digits to which the gradients in least agreement agree. Other properties checked in this way include frequencies, diagnostics, and populations.
If two numbers do not agree to the expected accuracy, then an asterisk, *, is printed after the number of digits in agreement.
Finally, you can do a detailed comparison of the contents of the ref and run subdirectories by typing make diff.
The input files in the verification suite are divided into several categories:
Psi 3 is a suite of ab initio codes related to the original Psi package started in Prof. Fritz Schaefer's group at UC Berkeley. Current version of MPQC works with stable versions of Psi 3 starting with 3.2.0. From now on we will refer to Psi 3 as simply Psi. Psi is written primarily in C and executes in serial mode only. The interface between Psi and MPQC is intended mainly for Psi users who wish to exploit MPQC's geometry optimization and frequency analyses capabilities with Psi energies and gradients.
The following sections explain how to use Psi from MPQC:
The rest of the Psi environment is job specific and specified in the input file.
Here's an example:
Note that keywords docc, socc, frozen_docc, frozen_uocc, total_charge, and multiplicity are used by appropriate specializations of PsiWavefunctions, i.e. PsiCLHF only checks for docc, etc.
PsiWavefunction specializations PsiCCSD and PsiCCSD_T also look for keyword reference which specifies the reference wave function (an object of type PsiSCF). All classes for correlated Psi wave functions will require such an object.
Here are a few examples of PsiWavefunctions:
Here's an optimization + subsequent frequency analysis on water molecule at the RHF CCSD 6-311G** level:
Common Component Architecture (CCA) component wrappers, conforming to interfaces developed for the CCA Chemistry Component Toolkit, have been created to encapsulate some MPQC functionality. The following components are provided by MPQC:
Example keyval input:
A backup model factory may be supplied. If an error is detected in the primary model, then a model obtained from the backup factory will be used. The molecule viewer is currently only used to communicate with the python viewer, in which case component instantiation and connection is handled automatically.
MPQC is open-source software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
MPQC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
Object-Oriented Input
Overview of the Object-Oriented Input
MPQC starts off by creating a ParsedKeyVal object that parses the input file specified on the command line. The format of the input file is documented in the KeyVal documentation. It is basically a free format input that associates keywords and logical groupings of keywords with values. The values can be scalars, arrays, or objects.
A Walk-Through of an Object-Oriented Input File
This example input does a Hartree-Fock calculation on water. Following is the entire input, followed by a breakdown with descriptions.
% This input does a Hartree-Fock calculation on water.
molecule<Molecule>: (
symmetry = C2V
unit = angstrom
{ atoms geometry } = {
O [ 0.00000000 0.00000000 0.37000000 ]
H [ 0.78000000 0.00000000 -0.18000000 ]
H [ -0.78000000 0.00000000 -0.18000000 ]
}
)
basis<GaussianBasisSet>: (
name = 'STO-3G'
molecule = $:molecule
)
mpqc: (
mole<CLHF>: (
molecule = $:molecule
basis = $:basis
)
)
% This input does a Hartree-Fock calculation on water.
molecule<Molecule>: (
symmetry = C2V
unit = angstrom
{ atoms geometry } = {
O [ 0.00000000 0.00000000 0.37000000 ]
H [ 0.78000000 0.00000000 -0.18000000 ]
H [ -0.78000000 0.00000000 -0.18000000 ]
}
)
basis<GaussianBasisSet>: (
name = 'STO-3G'
molecule = $:molecule
)
mpqc: (
mole<CLHF>: (
molecule = $:molecule
basis = $:basis
)
)
Sample Object-Oriented Input Files
The easiest way to get started with mpqc is to start with one of sample inputs that most nearly matches your problem. The src/bin/mpqc/samples contains all of the sample inputs below:
Hartree-Fock Energy
The following input will compute the Hartree-Fock energy of water.
% emacs should use -*- KeyVal -*- mode
% molecule specification
molecule<Molecule>: (
symmetry = C2V
unit = angstrom
{ atoms geometry } = {
O [ 0.00000000 0.00000000 0.37000000 ]
H [ 0.78000000 0.00000000 -0.18000000 ]
H [ -0.78000000 0.00000000 -0.18000000 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = 'STO-3G'
molecule = $:molecule
)
mpqc: (
checkpoint = no
savestate = no
% method for computing the molecule's energy
mole<CLHF>: (
molecule = $:molecule
basis = $:basis
memory = 16000000
)
)
MP2 Energy
The following input will compute the MP2 energy of water.
% emacs should use -*- KeyVal -*- mode
% molecule specification
molecule<Molecule>: (
symmetry = C2V
unit = angstrom
{ atoms geometry } = {
O [ 0.00000000 0.00000000 0.37000000 ]
H [ 0.78000000 0.00000000 -0.18000000 ]
H [ -0.78000000 0.00000000 -0.18000000 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = 'STO-3G'
molecule = $:molecule
)
mpqc: (
checkpoint = no
savestate = no
% method for computing the molecule's energy
mole<MBPT2>: (
molecule = $:molecule
basis = $:basis
memory = 16000000
% reference wavefunction
reference<CLHF>: (
molecule = $:molecule
basis = $:basis
memory = 16000000
)
)
)
MP2-R12 energy
The following will compute the MP2-R12 energy of water in standard approximation A' (MP2-R12/A').
% emacs should use -*- KeyVal -*- mode
% molecule specification
molecule<Molecule>: (
symmetry = C2V
unit = angstrom
{ atoms geometry } = {
O [ 0.00000000 0.00000000 0.37000000 ]
H [ 0.78000000 0.00000000 -0.18000000 ]
H [ -0.78000000 0.00000000 -0.18000000 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = 'cc-pVDZ'
molecule = $:molecule
)
% auxiliary basis set specification
abasis<GaussianBasisSet>: (
name = 'aug-cc-pVDZ'
molecule = $:molecule
)
mpqc: (
checkpoint = no
savestate = no
% method for computing the molecule's energy
mole<MBPT2_R12>: (
molecule = $:molecule
basis = $:basis
aux_basis = $:abasis
stdapprox = 'A''
nfzc = 1
memory = 16000000
integrals<IntegralCints>:()
% reference wavefunction
reference<CLHF>: (
molecule = $:molecule
basis = $:basis
memory = 16000000
integrals<IntegralCints>:()
)
)
)
Hartree-Fock Optimization
The following input will optimize the geometry of water using the quasi-Newton method.
% emacs should use -*- KeyVal -*- mode
% molecule specification
molecule<Molecule>: (
symmetry = C2V
unit = angstrom
{ atoms geometry } = {
O [ 0.00000000 0.00000000 0.37000000 ]
H [ 0.78000000 0.00000000 -0.18000000 ]
H [ -0.78000000 0.00000000 -0.18000000 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = '6-31G*'
molecule = $:molecule
)
mpqc: (
checkpoint = no
savestate = no
% molecular coordinates for optimization
coor<SymmMolecularCoor>: (
molecule = $:molecule
generator<IntCoorGen>: (
molecule = $:molecule
)
)
% method for computing the molecule's energy
mole<CLHF>: (
molecule = $:molecule
basis = $:basis
coor = $..:coor
memory = 16000000
)
% optimizer object for the molecular geometry
opt<QNewtonOpt>: (
function = $..:mole
update<BFGSUpdate>: ()
convergence<MolEnergyConvergence>: (
cartesian = yes
energy = $..:..:mole
)
)
)
Optimization with a Computed Guess Hessian
The following input will optimize the geometry of water using the quasi-Newton method. The guess Hessian will be computed at a lower level of theory.
% emacs should use -*- KeyVal -*- mode
% molecule specification
molecule<Molecule>: (
symmetry = C2V
unit = angstrom
{ atoms geometry } = {
O [ 0.00000000 0.00000000 0.37000000 ]
H [ 0.78000000 0.00000000 -0.18000000 ]
H [ -0.78000000 0.00000000 -0.18000000 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = '6-31G*'
molecule = $:molecule
)
mpqc: (
checkpoint = no
savestate = no
% molecular coordinates for optimization
coor<SymmMolecularCoor>: (
molecule = $:molecule
generator<IntCoorGen>: (
molecule = $:molecule
)
)
% method for computing the molecule's energy
mole<CLHF>: (
molecule = $:molecule
basis = $:basis
coor = $..:coor
memory = 16000000
guess_hessian<FinDispMolecularHessian>: (
molecule = $:molecule
only_totally_symmetric = yes
eliminate_cubic_terms = no
checkpoint = no
energy<CLHF>: (
molecule = $:molecule
memory = 16000000
basis<GaussianBasisSet>: (
name = '3-21G'
molecule = $:molecule
)
)
)
)
% optimizer object for the molecular geometry
opt<QNewtonOpt>: (
function = $..:mole
update<BFGSUpdate>: ()
convergence<MolEnergyConvergence>: (
cartesian = yes
energy = $..:..:mole
)
)
)
Optimization Using Newton's Method
The following input will optimize the geometry of water using the Newton's method. The Hessian will be computed at each step in the optimization. However, Hessian recomputation is usually not worth the cost; try using the computed Hessian as a guess Hessian for a quasi-Newton method before resorting to a Newton optimization.
% Emacs should use -*- KeyVal -*- mode
% molecule specification
molecule<Molecule>: (
symmetry = c2v
unit = angstrom
{ atoms geometry } = {
O [ 0.00000000 0.00000000 0.36937294 ]
H [ 0.78397590 0.00000000 -0.18468647 ]
H [ -0.78397590 0.00000000 -0.18468647 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = '3-21G'
molecule = $:molecule
)
mpqc: (
checkpoint = no
savestate = no
restart = no
% molecular coordinates for optimization
coor<SymmMolecularCoor>: (
molecule = $:molecule
generator<IntCoorGen>: (
molecule = $:molecule
)
)
do_energy = no
do_gradient = no
% method for computing the molecule's energy
mole<CLHF>: (
molecule = $:molecule
basis = $:basis
memory = 16000000
coor = $..:coor
guess_wavefunction<CLHF>: (
molecule = $:molecule
total_charge = 0
basis<GaussianBasisSet>: (
molecule = $:molecule
name = 'STO-3G'
)
memory = 16000000
)
hessian<FinDispMolecularHessian>: (
only_totally_symmetric = yes
eliminate_cubic_terms = no
checkpoint = no
)
)
optimize = yes
% optimizer object for the molecular geometry
opt<NewtonOpt>: (
print_hessian = yes
max_iterations = 20
function = $..:mole
convergence<MolEnergyConvergence>: (
cartesian = yes
energy = $..:..:mole
)
)
)
Hartree-Fock Frequencies
The following input will compute Hartree-Fock frequencies by finite displacements. A thermodynamic analysis will also be performed. If optimization input is also provided, then the optimization will be run first, then the frequencies.
% emacs should use -*- KeyVal -*- mode
% molecule specification
molecule<Molecule>: (
symmetry = C1
{ atoms geometry } = {
O [ 0.0000000000 0.0000000000 0.8072934188 ]
H [ 1.4325589285 0.0000000000 -0.3941980761 ]
H [ -1.4325589285 0.0000000000 -0.3941980761 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = 'STO-3G'
molecule = $:molecule
)
mpqc: (
checkpoint = no
savestate = no
% method for computing the molecule's energy
mole<CLHF>: (
molecule = $:molecule
basis = $:basis
memory = 16000000
)
% vibrational frequency input
freq<MolecularFrequencies>: (
molecule = $:molecule
)
)
Giving Coordinates and a Guess Hessian
The following example shows several features that are really independent. The variable coordinates are explicitly given, rather than generated automatically. This is especially useful when a guess Hessian is to be provided, as it is here. This Hessian, as given by the user, is not complete and the QNewtonOpt object will fill in the missing values using a guess the Hessian provided by the MolecularEnergy object. Also, fixed coordinates are given in this sample input.
% emacs should use -*- KeyVal -*- mode
% molecule specification
molecule<Molecule>: (
symmetry = C1
{ atoms geometry } = {
H [ 0.088 2.006 1.438 ]
O [ 0.123 3.193 0.000 ]
H [ 0.088 2.006 -1.438 ]
O [ 4.502 5.955 -0.000 ]
H [ 2.917 4.963 -0.000 ]
H [ 3.812 7.691 -0.000 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = 'STO-3G'
molecule = $:molecule
)
mpqc: (
checkpoint = no
savestate = no
% method for computing the molecule's energy
mole<CLHF>: (
molecule = $:molecule
basis = $:basis
coor = $..:coor
memory = 16000000
)
% molecular coordinates for optimization
coor<SymmMolecularCoor>: (
molecule = $:molecule
generator<IntCoorGen>: (
molecule = $:molecule
extra_bonds = [ 2 5 ]
)
% use these instead of generated coordinates
variable<SetIntCoor>: [
<StreSimpleCo>:( atoms = [ 2 5 ] )
<BendSimpleCo>:( atoms = [ 2 5 4 ] )
<OutSimpleCo>: ( atoms = [ 5 2 1 3 ] )
<SumIntCoor>: (
coor: [
<StreSimpleCo>:( atoms = [ 1 2 ] )
<StreSimpleCo>:( atoms = [ 2 3 ] )
]
coef = [ 1.0 1.0 ]
)
<SumIntCoor>: (
coor: [
<StreSimpleCo>:( atoms = [ 4 5 ] )
<StreSimpleCo>:( atoms = [ 4 6 ] )
]
coef = [ 1.0 1.0 ]
)
<BendSimpleCo>:( atoms = [ 1 2 3 ] )
<BendSimpleCo>:( atoms = [ 5 4 6 ] )
]
% these are fixed by symmetry anyway,
fixed<SetIntCoor>: [
<SumIntCoor>: (
coor: [
<StreSimpleCo>:( atoms = [ 1 2 ] )
<StreSimpleCo>:( atoms = [ 2 3 ] )
]
coef = [ 1.0 -1.0 ]
)
<SumIntCoor>: (
coor: [
<StreSimpleCo>:( atoms = [ 4 5 ] )
<StreSimpleCo>:( atoms = [ 4 6 ] )
]
coef = [ 1.0 -1.0 ]
)
<TorsSimpleCo>:( atoms = [ 2 5 4 6] )
<OutSimpleCo>:( atoms = [ 3 2 6 4 ] )
<OutSimpleCo>:( atoms = [ 1 2 6 4 ] )
]
)
% optimizer object for the molecular geometry
opt<QNewtonOpt>: (
function = $..:mole
update<BFGSUpdate>: ()
convergence<MolEnergyConvergence>: (
cartesian = yes
energy = $..:..:mole
)
% give a partial guess hessian in internal coordinates
% the missing elements will be filled in automatically
hessian = [
[ 0.0109261670 ]
[ -0.0004214845 0.0102746106 ]
[ -0.0008600592 0.0030051330 0.0043149957 ]
[ 0.0 0.0 0.0 ]
[ 0.0 0.0 0.0 ]
[ 0.0 0.0 0.0 ]
[ 0.0 0.0 0.0 ]
]
)
)
Optimization with a Hydrogen Bond
The automatic internal coordinate generator will fail if it cannot find enough redundant internal coordinates. In this case, the internal coordinate generator must be explicitly created in the input and given extra connectivity information, as is shown below.
% emacs should use -*- KeyVal -*- mode
% molecule specification
molecule<Molecule>: (
symmetry = C1
{ atoms geometry } = {
H [ 0.088 2.006 1.438 ]
O [ 0.123 3.193 0.000 ]
H [ 0.088 2.006 -1.438 ]
O [ 4.502 5.955 -0.000 ]
H [ 2.917 4.963 -0.000 ]
H [ 3.812 7.691 -0.000 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = 'STO-3G'
molecule = $:molecule
)
mpqc: (
checkpoint = no
savestate = no
% method for computing the molecule's energy
mole<CLHF>: (
molecule = $:molecule
basis = $:basis
coor = $..:coor
memory = 16000000
)
% molecular coordinates for optimization
coor<SymmMolecularCoor>: (
molecule = $:molecule
% give an internal coordinate generator that knows about the
% hydrogen bond between atoms 2 and 5
generator<IntCoorGen>: (
molecule = $:molecule
extra_bonds = [ 2 5 ]
)
)
% optimizer object for the molecular geometry
opt<QNewtonOpt>: (
function = $..:mole
update<BFGSUpdate>: ()
convergence<MolEnergyConvergence>: (
cartesian = yes
energy = $..:..:mole
)
)
)
Fixed Coordinate Optimization
This example shows how to selectively fix internal coordinates in an optimization. Any number of linearly independent coordinates can be given. These coordinates must remain linearly independent throughout the optimization, a condition that might not hold since the coordinates can be nonlinear.
% emacs should use -*- KeyVal -*- mode
% molecule specification
molecule<Molecule>: (
symmetry = CS
{ atoms geometry } = {
H [ 3.04 -0.69 -1.59 ]
H [ 3.04 -0.69 1.59 ]
N [ 2.09 -0.48 -0.00 ]
C [ -0.58 -0.15 0.00 ]
H [ -1.17 1.82 0.00 ]
H [ -1.41 -1.04 -1.64 ]
H [ -1.41 -1.04 1.64 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = '3-21G*'
molecule = $:molecule
)
mpqc: (
checkpoint = no
savestate = no
% molecular coordinates for optimization
coor<SymmMolecularCoor>: (
molecule = $:molecule
generator<IntCoorGen>: (
molecule = $:molecule
)
have_fixed_values = yes
fixed<SetIntCoor>: [
<OutSimpleCo>: ( value = -0.1
label = 'N-inversion'
atoms = [4 3 2 1] )
]
)
% method for computing the molecule's energy
mole<CLHF>: (
molecule = $:molecule
basis = $:basis
coor = $..:coor
memory = 16000000
)
% optimizer object for the molecular geometry
opt<QNewtonOpt>: (
max_iterations = 20
function = $..:mole
update<BFGSUpdate>: ()
convergence<MolEnergyConvergence>: (
cartesian = yes
energy = $..:..:mole
)
)
)
Transition State Optimization
This example shows a transition state optimization of the N-inversion in $mathrm{CH}_3mathrm{NH}_2$ using mode following. The initial geometry was obtained by doing a few fixed coordinate optimizations along the inversion coordinate.
% emacs should use -*- KeyVal -*- mode
% molecule specification
molecule<Molecule>: (
symmetry = CS
{ atoms geometry } = {
H [ 3.045436 -0.697438 -1.596748 ]
H [ 3.045436 -0.697438 1.596748 ]
N [ 2.098157 -0.482779 -0.000000 ]
C [ -0.582616 -0.151798 0.000000 ]
H [ -1.171620 1.822306 0.000000 ]
H [ -1.417337 -1.042238 -1.647529 ]
H [ -1.417337 -1.042238 1.647529 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = '3-21G*'
molecule = $:molecule
)
mpqc: (
checkpoint = no
savestate = no
% molecular coordinates for optimization
coor<SymmMolecularCoor>: (
molecule = $:molecule
generator<IntCoorGen>: (
molecule = $:molecule
)
followed<OutSimpleCo> = [ 'N-inversion' 4 3 2 1 ]
)
% method for computing the molecule's energy
mole<CLHF>: (
molecule = $:molecule
basis = $:basis
coor = $..:coor
memory = 16000000
)
% optimizer object for the molecular geometry
opt<EFCOpt>: (
transition_state = yes
mode_following = yes
max_iterations = 20
function = $..:mole
update<PowellUpdate>: ()
convergence<MolEnergyConvergence>: (
cartesian = yes
energy = $..:..:mole
)
)
)
Transition State Optimization with a Computed Guess Hessian
This example shows a transition state optimization of the N-inversion in $mathrm{CH}_3mathrm{NH}_2$ using mode following. The initial geometry was obtained by doing a few fixed coordinate optimizations along the inversion coordinate. An approximate guess Hessian will be computed, which makes the optimiziation converge much faster in this case.
% emacs should use -*- KeyVal -*- mode
% molecule specification
molecule<Molecule>: (
symmetry = CS
{ atoms geometry } = {
H [ 3.045436 -0.697438 -1.596748 ]
H [ 3.045436 -0.697438 1.596748 ]
N [ 2.098157 -0.482779 -0.000000 ]
C [ -0.582616 -0.151798 0.000000 ]
H [ -1.171620 1.822306 0.000000 ]
H [ -1.417337 -1.042238 -1.647529 ]
H [ -1.417337 -1.042238 1.647529 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = '3-21G*'
molecule = $:molecule
)
mpqc: (
checkpoint = no
savestate = no
% molecular coordinates for optimization
coor<SymmMolecularCoor>: (
molecule = $:molecule
generator<IntCoorGen>: (
molecule = $:molecule
)
followed<OutSimpleCo> = [ 'N-inversion' 4 3 2 1 ]
)
% method for computing the molecule's energy
mole<CLHF>: (
molecule = $:molecule
basis = $:basis
coor = $..:coor
memory = 16000000
guess_hessian<FinDispMolecularHessian>: (
molecule = $:molecule
only_totally_symmetric = yes
eliminate_cubic_terms = no
checkpoint = no
energy<CLHF>: (
molecule = $:molecule
memory = 16000000
basis<GaussianBasisSet>: (
name = '3-21G'
molecule = $:molecule
)
)
)
)
% optimizer object for the molecular geometry
opt<EFCOpt>: (
transition_state = yes
mode_following = yes
max_iterations = 20
function = $..:mole
update<PowellUpdate>: ()
convergence<MolEnergyConvergence>: (
cartesian = yes
energy = $..:..:mole
)
)
)
Hartree-Fock energy with intermediate checkpointing
The following two sections demonstrate how MPQC can be used to save the mole object periodically. This input will compute the Hartree-Fock energy of water while saving the mole object every 3 iterations.
% emacs should use -*- KeyVal -*- mode
% molecule specification
molecule<Molecule>: (
symmetry = C2V
unit = angstrom
{ atoms geometry } = {
O [ 0.00000000 0.00000000 0.37000000 ]
H [ 0.78000000 0.00000000 -0.18000000 ]
H [ -0.78000000 0.00000000 -0.18000000 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = 'STO-3G'
molecule = $:molecule
)
mpqc: (
checkpoint = yes
filename = 'h2o-rhf-STO3G'
checkpoint_freq = 3
savestate = no
% method for computing the molecule's energy
mole<CLHF>: (
molecule = $:molecule
basis = $:basis
memory = 16000000
)
)
MP2-R12 energy with intermediate checkpointing
The following input will compute the MP2-R12 energy of water in standard approximation A' (MP2-R12/A') while saving the mole object at intermediate checkpoints.
% emacs should use -*- KeyVal -*- mode
% molecule specification
molecule<Molecule>: (
symmetry = C2V
unit = angstrom
{ atoms geometry } = {
O [ 0.00000000 0.00000000 0.37000000 ]
H [ 0.78000000 0.00000000 -0.18000000 ]
H [ -0.78000000 0.00000000 -0.18000000 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = 'cc-pVDZ'
molecule = $:molecule
)
% auxiliary basis set specification
abasis<GaussianBasisSet>: (
name = 'aug-cc-pVDZ'
molecule = $:molecule
)
mpqc: (
checkpoint = yes
filename = 'h2o-mp2r12ap-vdz-avdz'
savestate = no
% method for computing the molecule's energy
mole<MBPT2_R12>: (
molecule = $:molecule
basis = $:basis
aux_basis = $:abasis
stdapprox = 'A''
nfzc = 1
memory = 16000000
integrals<IntegralCints>:()
% reference wavefunction
reference<CLHF>: (
molecule = $:molecule
basis = $:basis
memory = 16000000
integrals<IntegralCints>:()
)
)
)
HF gradient computed from a previously computed HF wave funtion
The following will illustrate how to reuse previously computed MolecularEnergy objects in subsequent computations. The first input computes Hartree-Fock energy for water and saves the mole object to file h2o-rhf-sto3g.wfn.
% emacs should use -*- KeyVal -*- mode
% molecule specification
molecule<Molecule>: (
symmetry = C2V
unit = angstrom
{ atoms geometry } = {
O [ 0.00000000 0.00000000 0.37000000 ]
H [ 0.78000000 0.00000000 -0.18000000 ]
H [ -0.78000000 0.00000000 -0.18000000 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = 'STO-3G'
molecule = $:molecule
)
mpqc: (
checkpoint = no
savestate = yes
filename = 'h2o-rhf-sto3g'
% method for computing the molecule's energy
mole<CLHF>: (
molecule = $:molecule
basis = $:basis
memory = 16000000
)
)
% emacs should use -*- KeyVal -*- mode
mpqc: (
checkpoint = no
savestate = no
restart = yes
restart_file = 'h2o-rhf-sto3g.wfn'
do_gradient = yes
)
MP2 Energy computed using precomputed Hartree-Fock wave function
The following input will compute the MP2 energy of water using a saved Hartree-Fock wave function obtained using the first input from HF gradient computed from a previously computed HF wave funtion.
% emacs should use -*- KeyVal -*- mode
% molecule specification
molecule<Molecule>: (
symmetry = C2V
unit = angstrom
{ atoms geometry } = {
O [ 0.00000000 0.00000000 0.37000000 ]
H [ 0.78000000 0.00000000 -0.18000000 ]
H [ -0.78000000 0.00000000 -0.18000000 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = 'STO-3G'
molecule = $:molecule
)
% wave function file object specification
wfnfile<BcastStateInBin>:file = 'h2o-rhf-sto3g.wfn'
mpqc: (
checkpoint = no
savestate = no
% method for computing the molecule's energy
mole<MBPT2>: (
molecule = $:molecule
basis = $:basis
memory = 16000000
% reference wavefunction
reference<SavableStateProxy>: (
statein = $:wfnfile
object = 'CLHF'
)
)
)
CLHF energy using a CCA integrals component
The following input will compute the CLHF energy of water using a CCA integrals component via the IntegralCCA adaptor class.
% emacs should use -*- KeyVal -*- mode
% molecule specification
molecule<Molecule>: (
symmetry = C2V
unit = angstrom
{ atoms geometry } = {
O [ 0.00000000 0.00000000 0.37000000 ]
H [ 0.78000000 0.00000000 -0.18000000 ]
H [ -0.78000000 0.00000000 -0.18000000 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = 'STO-3G'
molecule = $:molecule
)
mpqc: (
% path to component libraries
cca_path = /usr/local/lib/cca
% sidl class names of components which will be instantiated
cca_load = MPQC.IntegralEvaluatorFactory
do_cca = yes
checkpoint = no
savestate = no
% method for computing the molecule's energy
mole<CLHF>: (
molecule = $:molecule
basis = $:basis
% cca integrals adaptor class
integrals<IntegralCCA>: (
molecule = $:molecule
% integral buffer type
integral_buffer = opaque
% integral package
integral_package = intv3
% factory component sidl class name
evaluator_factory = MPQC.IntegralEvaluatorFactory
)
)
)
Validating MPQC
Running Psi 3 from MPQC
How the MPQC-Psi interface works
The current version of the interface is rather slim. It is only possible to import energies and gradients computed with Psi into MPQC, i.e. wave functions cannot be imported. All MPQC-Psi interaction happens via text files and system calls. MPQC generates input file for Psi, calls appropriate Psi modules, and then parses the output files for energies and gradients.
Environmental Variables
Several environmental variables are used to control MPQC-Psi interaction:
Preparing an input file
As noted above, MPQC parses the input file, and as such the input file has to be in the MPQC OO input format. All features of usual MPQC input files are there (mpqc section, mole MolecularEnergy object, etc.). In addition the following rules apply:
Psi Execution Environment
Each PsiWavefunction-derived class has to have a member object called psienv of type PsiExEnv. The following keywords are used by its KeyVal constructor:
psienv<PsiExEnv>: (
cwd = ./
fileprefix = psi.test
nscratch = 2
scratch = [ '/scratch1/' '/scratch2/' ]
)
PsiWavefunction specializations
Class PsiWavefunction is derived from class Wavefunction, hence its KeyVal constructor uses all keywords that Wavefunction's KeyVal constructor uses (basis, molecule, etc.). In addition, PsiWavefunction's KeyVal constructor looks for the following keywords in the input file:
%
% ROHF DZ on F atom
%
mole<PsiHSOSHF>: (
docc = [ 2 0 0 0 0 1 1 0 ] socc = [ 0 0 0 0 0 0 0 1]
memory = 10000000
% Psi Environment data
psienv<PsiExEnv>: (
cwd = ./
fileprefix = f.dz.test
stdout = f.dz.test.stdout
stderr = f.dz.test.stderr
nscratch = 1
scratch = [ '/scratch/mpqc/' ]
)
% MolecularEnergy input
molecule<Molecule>: (
{atoms geometry} = {
F [ 0.0 0.0 0.0 ]
}
)
% Basis input
basis<GaussianBasisSet>: (
molecule = $..:molecule
name = 'DZ (Dunning)'
)
)
%
% RHF CCSD/cc-pVDZ on water
%
mole<PsiCCSD>: (
frozen_docc = [1 0 0 0]
memory = 40000000
% Psi Environment data
psienv<PsiExEnv>: (
cwd = ./
fileprefix = h2o.ccpvdz.ccsd.test
nscratch = 1
scratch = [ '/tmp/' ]
)
% MolecularEnergy input
molecule<Molecule>: (
{atoms geometry} = {
H [ -1.5 0.0 -0.3 ]
H [ 1.5 0.0 -0.3 ]
O [ 0.0 0.0 1.0 ]
}
)
% Basis input
basis<GaussianBasisSet>: (
molecule = $..:molecule
name = 'cc-pVDZ'
)
reference<PsiCLHF>: (
psienv = $..:psienv
molecule = $..:molecule
basis = $..:basis
total_charge = 0
multiplicity = 1
)
)
More examples
This section contains some examples of complete inputs that specify an MPQC/Psi computations.
% Emacs should use -*- KeyVal -*- mode
% this file was automatically generated
% label: water test series
% molecule specification
molecule<Molecule>: (
symmetry = C2V
unit = angstrom
{ atoms geometry } = {
O [ 0.000000000000 0.000000000000 0.369372944000 ]
H [ 0.783975899000 0.000000000000 -0.184686472000 ]
H [ -0.783975899000 0.000000000000 -0.184686472000 ]
}
)
% basis set specification
basis<GaussianBasisSet>: (
name = '6-311G**'
molecule = $:molecule
)
% Psi environment specification
psienv<PsiExEnv>: (
cwd = ./
fileprefix = mpqcpsi
stdout = mpqcpsi.stdout
stderr = mpqcpsi.stderr
nscratch = 1
scratch = [ '/scratch/evaleev/' ]
)
mpqc: (
checkpoint = no
savestate = no
restart = no
coor<SymmMolecularCoor>: (
molecule = $:molecule
generator<IntCoorGen>: (
molecule = $:molecule
)
)
% molecular coordinates for optimization do_energy = yes
do_gradient = no
% method for computing the molecule's energy
mole<PsiCCSD>: (
molecule = $:molecule
basis = $:basis
coor = $..:coor
psienv = $:psienv
memory = 32000000
reference<PsiCLHF>: (
psienv = $:psienv
molecule = $:molecule
total_charge = 0
multiplicity = 1
basis = $:basis
memory = 32000000
)
hessian<FinDispMolecularHessian>: (
point_group<PointGroup>: symmetry = C2V
checkpoint = no
restart = no
)
)
optimize = yes
% optimizer object for the molecular geometry
opt<QNewtonOpt>: (
max_iterations = 20
function = $..:mole
update<BFGSUpdate>: ()
convergence<MolEnergyConvergence>: (
cartesian = yes
energy = $..:..:mole
)
)
% vibrational frequency input
freq<MolecularFrequencies>: (
point_group<PointGroup>: symmetry = C2V
molecule = $:molecule
)
)
CCA Components
MPQC.Chemistry_QC_ModelFactory
This is an implementation of the Chemistry.QC.ModelFactory interface. This factory produces model objects (implementing the Chemistry.QC.Model interface) based on the MPQC package. The MPQC model allows calculation of molecular energies and energy derivatives using a variety of methods.
Provides Ports
Uses Ports
Parameters
Keyval Input
The theory and basis parameters allow very basic calculations to be performed. More complex calculations will require the use of a keyval input file. The keyval file format is the same as that used to run MPQC stand-alone, and any valid MPQC options may be used. The molecular energy object must be named model. The user-supplied keyval cannot contain a molecule section; the molecule section will be automatically inserted by the ModelFactory using the required molecule_filename. This molecule section should be referred to as $:molecule.
model<CLHF>:(
molecule=$:molecule
basis<GaussianBasisSet>:(
name = '6-31G'
molecule = $:molecule
)
)
MPQC.ChemistryOpt_CoordinateModel
This is an implementation of the ChemistryOpt.CoordinateModel interface based on the MPQC package. It supports molecular structure optimization in cartesian, symmetrized internal, and redundant internal coordinates. Hessian approximation is supported.
Provides Ports
Uses Ports
Parameters
MPQC.IntegralEvaluatorFactory
This is an implementation of the Chemistry.QC.GaussianBasis.IntegralEvaluatorFactory interface. This factory produces molecular integral evaluator objects based on the MPQC package. This code is experimental and does not currently support derivative integrals.
Provides Ports
Parameters
MPQC License
MPQC Warranty