conversion_factors

esta.measure.conversion_factors

1. library to get conversion factor to convert quantities from once to another
2. get commanly use physical constants in physical and chemical sciences

NOTE: ii ---> means → inverse NOTE: har2kjmolii → hartree conversion factor to kj mol^-1 (factor = 2625.49963948) NOTE: dynecmii2evAng2 → dyne cm^-1 to eV Ang^-2 ,.... might change to dynecmii_to_eVAngii2

WARNING: use scipy version >=1.4.1 otherwise you get inaccurate constants after 6-7 decimal places

      # with scipy version 1.1.0
      #bohr radius= 5.2917721067e-11 m ; less accurate
      #fac = cf.bohr2ang =0.529177210669 --< -- less accuaret and
      # as a result atoms pos and cell param are wrong after 6 dec     # places
      #In scipy version 1.4.1
      #bohr radiun = 5.29177210903e-11 m; is same as given 
      # in nist data ; https://physics.nist.gov/cgi-bin/cuu/Value?bohrrada0
      #Numerical value     5.291 772 109 03 x 10-11 m 
      #fac = 0.529177210903
      # so take bohr2ang = 0.529177210903 if using lower version than required

Author: S. Kumar, email: sonukumar.physics@gmail.com