Study the long – range potential for H2, N2, O2, NO, N2O, H2O, NH3, CH4 in ground state

Abstract

in this paper, we calculate the Vander Waals coefficient for many Molecules in ground state ,this is dispersion energy coefficient for three molecules interaction Vabc (each one have dipole). And the retardation coefficient f6(R) for two molecule interaction for different distances, then studying potential interaction V(R) for two molecule and depended on effects retardation for molecules study .Our results cannot comparative with other estimations.