Coupling-type change e → c in slow collisions X(J=1)+Y(1S0) of polarized atoms

An analytical model is considered to the e → c change of Hund's coupling cases in the X(J=1) + Y(1S0) collision of polarized atoms. Deviation from a widely used approximation of a sudden change of the coupling scheme is shown to exceed 10% for realistic interatomic potentials. The proposed analytical model for population redistribution in quasimolecular states that results from passage through a region where the type of coupling changes is in good agreement with the reported numerical calculations for the dispersion interatomic interaction. 27 refs., 4 figs., 2 tabs