/usr/share/psi/python/p4const/physconst.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
#
# Do not modify this file! It is auto-generated by the document_options_and_tests
# script, from psi4topdir/include/physconst.h
psi_h = 6.62606896E-34 # The Planck constant (Js)
psi_c = 2.99792458E8 # Speed of light (ms$^{-1}$)
psi_kb = 1.3806504E-23 # The Boltzmann constant (JK$^{-1}$)
psi_R = 8.314472 # Universal gas constant (JK$^{-1}$mol$^{-1}$)
psi_bohr2angstroms = 0.52917720859 # Bohr to Angstroms conversion factor
psi_bohr2m = 0.52917720859E-10 # Bohr to meters conversion factor
psi_bohr2cm = 0.52917720859E-8 # Bohr to centimeters conversion factor
psi_amu2g = 1.660538782E-24 # Atomic mass units to grams conversion factor
psi_amu2kg = 1.660538782E-27 # Atomic mass units to kg conversion factor
psi_au2amu = 5.485799097E-4 # Atomic units (m$@@e$) to atomic mass units conversion factor
psi_hartree2J = 4.359744E-18 # Hartree to joule conversion factor
psi_hartree2aJ = 4.359744 # Hartree to attojoule (10$^{-18}$J) conversion factor
psi_cal2J = 4.184 # Calorie to joule conversion factor
psi_dipmom_au2si = 8.47835281E-30 # Atomic units to SI units (Cm) conversion factor for dipoles
psi_dipmom_au2debye = 2.54174623 # Atomic units to Debye conversion factor for dipoles
psi_dipmom_debye2si = 3.335640952E-30 # Debye to SI units (Cm) conversion factor for dipoles
psi_c_au = 137.035999679 # Speed of light in atomic units
psi_hartree2ev = 27.21138 # Hartree to eV conversion factor
psi_hartree2wavenumbers = 219474.6 # Hartree to cm$^{-1}$ conversion factor
psi_hartree2kcalmol = 627.5095 # Hartree to kcal mol$^{-1}$ conversion factor
psi_hartree2MHz = 6.579684E9 # Hartree to MHz conversion factor
psi_kcalmol2wavenumbers = 349.7551 # kcal mol$^{-1}$ to cm$^{-1}$ conversion factor
psi_e0 = 8.854187817E-12 # Vacuum permittivity (Fm$^{-1}$)
psi_na = 6.02214179E23 # Avagadro's number
psi_me = 9.10938215E-31 # Electron rest mass (in kg)
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