Towards universal potentials for (H2)2 and isotopic variants: post-Born-Oppenheimer contributions.
Adiabatic corrections are evaluated for the interaction of two hydrogen molecules (H(2))(2) and isotopic variants. Their contribution to the cluster formation amount up to 10% of the interaction energy. Added to the best ab initio Born-Oppenheimer isotropic potential, they correct especially its short range repulsive part. Calculations of second virial coefficients are improved in general, with an impressive agreement with experiments for gaseous D(2) in a large range of temperatures. The potentials are available in both analytical and numerical forms.
Laboratório de Atomos e Moléculas Especiais, Departamento de Física, ICEx, Universidade Federal de Minas Gerais, CP 702, 30123-970 Belo Horizonte, MG, Brazil.
Leonardo G
LG
Diniz
José R
JR
Mohallem