class Constants:

    ha2kcalmol = 627.509   #: Hartee^-1 kcal mol-1
    ha2kJmol = 2625.50     #: Hartree^-1 kJ mol-1
    eV2ha = 0.0367493      #: Hartree ev^-1
    a02ang = 0.529177      #: Å bohr^-1
    ang2a0 = 1.0 / a02ang  #: bohr Å^-1
