/usr/share/psi/python/gaussian_n.py is in psi4-data 1:0.3-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#@BEGIN LICENSE
#
# PSI4: an ab initio quantum chemistry software package
#
# This program is free 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.
#
# This program 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.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
#@END LICENSE
#
# Gn theory.
import re
import os
import math
import warnings
#CUimport psi4
#CUimport p4const
#CUimport p4util
from driver import *
#from extend_Molecule import *
#CUfrom molutil import *
#CUfrom p4regex import *
# never import aliases into this file
def run_gaussian_2(name, **kwargs):
# throw an exception for open-shells
if (psi4.get_option('SCF','REFERENCE') != 'RHF' ):
raise ValidationError("""g2 computations require "reference rhf".""")
# stash user options:
optstash = p4util.OptionsState(
['FNOCC','COMPUTE_TRIPLES'],
['FNOCC','COMPUTE_MP4_TRIPLES'],
['FREEZE_CORE'],
['SCF','SCF_TYPE'])
# override default scf_type
psi4.set_local_option('SCF','SCF_TYPE','OUT_OF_CORE')
# optimize geometry at scf level
psi4.clean()
psi4.set_global_option('BASIS',"6-31G(D)")
optimize('scf')
psi4.clean()
# scf frequencies for zpe
frequency('scf')
# thermodynamic properties
du = psi4.get_variable('INTERNAL ENERGY CORRECTION')
dh = psi4.get_variable('ENTHALPY CORRECTION')
dg = psi4.get_variable('GIBBS FREE ENERGY CORRECTION')
ref = psi4.wavefunction()
freqs = ref.frequencies()
nfreq = freqs.dim(0)
freqsum = 0.0
for i in range (0,nfreq):
freqsum += freqs.get(i)
zpe = freqsum / p4const.psi_hartree2wavenumbers * 0.8929 * 0.5
psi4.clean()
# optimize geometry at mp2 (no frozen core) level
# note: freeze_core isn't an option in MP2
psi4.set_global_option('FREEZE_CORE',"FALSE")
optimize('conv-mp2')
psi4.clean()
# qcisd(t)
psi4.set_local_option('FNOCC','COMPUTE_MP4_TRIPLES',"TRUE")
psi4.set_global_option('FREEZE_CORE',"TRUE")
psi4.set_global_option('BASIS',"6-311G(D_P)")
run_fnocc('qcisd(t)',**kwargs)
# HLC: high-level correction based on number of valence electrons
ref = psi4.wavefunction()
nirrep = ref.nirrep()
frzcpi = ref.frzcpi()
nfzc = 0
for i in range (0,nirrep):
nfzc += frzcpi[i]
nalpha = ref.nalpha() - nfzc
nbeta = ref.nbeta() - nfzc
# hlc of gaussian-2
hlc = -0.00481 * nalpha -0.00019 * nbeta
# hlc of gaussian-1
hlc1 = -0.00614 * nalpha
eqci_6311gdp = psi4.get_variable("QCISD(T) TOTAL ENERGY")
emp4_6311gd = psi4.get_variable("MP4 TOTAL ENERGY")
emp2_6311gd = psi4.get_variable("MP2 TOTAL ENERGY")
psi4.clean()
# correction for diffuse functions
psi4.set_global_option('BASIS',"6-311+G(D_P)")
energy('mp4')
emp4_6311pg_dp = psi4.get_variable("MP4 TOTAL ENERGY")
emp2_6311pg_dp = psi4.get_variable("MP2 TOTAL ENERGY")
psi4.clean()
# correction for polarization functions
psi4.set_global_option('BASIS',"6-311G(2DF_P)")
energy('mp4')
emp4_6311g2dfp = psi4.get_variable("MP4 TOTAL ENERGY")
emp2_6311g2dfp = psi4.get_variable("MP2 TOTAL ENERGY")
psi4.clean()
# big basis mp2
psi4.set_global_option('BASIS',"6-311+G(3DF_2P)")
#run_fnocc('_mp2',**kwargs)
energy('conv-mp2')
emp2_big = psi4.get_variable("MP2 TOTAL ENERGY")
psi4.clean()
eqci = eqci_6311gdp
e_delta_g2 = emp2_big + emp2_6311gd - emp2_6311g2dfp - emp2_6311pg_dp
e_plus = emp4_6311pg_dp - emp4_6311gd
e_2df = emp4_6311g2dfp - emp4_6311gd
eg2 = eqci + e_delta_g2 + e_plus + e_2df
eg2_mp2_0k = eqci + (emp2_big - emp2_6311gd) + hlc + zpe
psi4.print_out('\n')
psi4.print_out(' ==> G1/G2 Energy Components <==\n')
psi4.print_out('\n')
psi4.print_out(' QCISD(T): %20.12lf\n' % eqci)
psi4.print_out(' E(Delta): %20.12lf\n' % e_delta_g2)
psi4.print_out(' E(2DF): %20.12lf\n' % e_2df)
psi4.print_out(' E(+): %20.12lf\n' % e_plus)
psi4.print_out(' E(G1 HLC): %20.12lf\n' % hlc1)
psi4.print_out(' E(G2 HLC): %20.12lf\n' % hlc)
psi4.print_out(' E(ZPE): %20.12lf\n' % zpe)
psi4.print_out('\n')
psi4.print_out(' ==> 0 Kelvin Results <==\n')
psi4.print_out('\n')
eg2_0k = eg2 + zpe + hlc
psi4.print_out(' G1: %20.12lf\n' % (eqci + e_plus + e_2df + hlc1 + zpe))
psi4.print_out(' G2(MP2): %20.12lf\n' % eg2_mp2_0k)
psi4.print_out(' G2: %20.12lf\n' % eg2_0k)
psi4.set_variable("G1 TOTAL ENERGY",eqci + e_plus + e_2df + hlc1 + zpe)
psi4.set_variable("G2 TOTAL ENERGY",eg2_0k)
psi4.set_variable("G2(MP2) TOTAL ENERGY",eg2_mp2_0k)
psi4.print_out('\n')
T = psi4.get_global_option('T')
psi4.print_out(' ==> %3.0lf Kelvin Results <==\n'% T)
psi4.print_out('\n')
internal_energy = eg2_mp2_0k + du - zpe / 0.8929
enthalpy = eg2_mp2_0k + dh - zpe / 0.8929
gibbs = eg2_mp2_0k + dg - zpe / 0.8929
psi4.print_out(' G2(MP2) energy: %20.12lf\n' % internal_energy )
psi4.print_out(' G2(MP2) enthalpy: %20.12lf\n' % enthalpy)
psi4.print_out(' G2(MP2) free energy: %20.12lf\n' % gibbs)
psi4.print_out('\n')
psi4.set_variable("G2(MP2) INTERNAL ENERGY",internal_energy)
psi4.set_variable("G2(MP2) ENTHALPY",enthalpy)
psi4.set_variable("G2(MP2) FREE ENERGY",gibbs)
internal_energy = eg2_0k + du - zpe / 0.8929
enthalpy = eg2_0k + dh - zpe / 0.8929
gibbs = eg2_0k + dg - zpe / 0.8929
psi4.print_out(' G2 energy: %20.12lf\n' % internal_energy )
psi4.print_out(' G2 enthalpy: %20.12lf\n' % enthalpy)
psi4.print_out(' G2 free energy: %20.12lf\n' % gibbs)
psi4.set_variable("CURRENT ENERGY",eg2_0k)
psi4.set_variable("G2 INTERNAL ENERGY",internal_energy)
psi4.set_variable("G2 ENTHALPY",enthalpy)
psi4.set_variable("G2 FREE ENERGY",gibbs)
psi4.clean()
optstash.restore()
# return 0K g2 results
return eg2_0k
# aliases for g2
procedures['energy']['gaussian-2'] = run_gaussian_2
procedures['energy']['g2'] = run_gaussian_2
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