CORRECTIONS TO THE CENTRIFUGAL SUDDEN WAVE-PACKET APPROXIMATION IN THE MOLECULAR-SCATTERING THEORY

The effect of the neglected off-diagonal coupled terms in the centrifu gal sudden (CS) approximate Hamiltonian of an atom-molecule scattering system on the scattering results is considered. Corrections to the ce ntrifugal sudden wave packet (CSWP) approximation developed by Kouri e t al. are completed by introducing the corrected operator W into the c oupled channel Schrodinger equation and expanding the exact scattering wave function in che Lippmann-Schwinger (L-S) equation in terms of th e CSWP wave function. The corrected CSWP approximation not only has hi gher accuracy, but also can calculate atom-molecule low energy scatter ing and atom-heteronuclear diatomic molecule scattering.