Constants and Conversion Units

constantvalue
h (Planck's constant)6.6260755*10-34 J s
R (Gas constant)8.3145112 J K-1 mol-1 = 1.9872159 cal K-1 mol-1
kB (Boltzman's constant)1.380658*10-23 J K-1
NA (Avogadro's number)6.0221367*1023 mol-1
c (speed of light)2.99792458*1010 cm s-1


unitconversion factor
1 Hartree4.3597482*10-18 J
1 Hartree627.509 kcal mol-1
1 Hartree27.2116 eV
1 kcal mol-14.184 kJ mol-1
1 Electron volt23.06035 kcal mol-1
1 Bohr0.529177249 Angstroms
ZPVE (Hartree)2.27817*10-6 * vib. wavenumber (cm-1)
vibrational temperatur Tv (K)1.43877 * vib. wavenumber (cm-1)


A more comprehensive collection of constants and conversion factors can be found on the
Physical Reference Data webpage of the American National Institute of Standards. 
last changes: 21.11.2005, HZ
questions & comments to: zipse@cup.uni-muenchen.de