K. Sakimoto, SUDDEN APPROXIMATION FOR COLLISION-INDUCED DISSOCIATION, Journal of physics. B, Atomic molecular and optical physics, 30(17), 1997, pp. 3881-3895
Collision-induced dissociation (CID) in atom-diatom non-reactive syste
ms is studied quantum mechanically by treating the rotational and vibr
ational degrees of freedom in a sudden approximation. The collision pr
oblem to be solved is reduced to a one-dimensional Schrodinger equatio
n with respect to the intermolecular radial distance. Therefore, only
the scattering phase shift is an important quantity, and a physical in
sight into the collision dynamics can be obtained by observing the dep
endence of the scattering phase shift on the molecular orientation and
on the internuclear distance of the molecule. The sudden approximatio
n is applied to He + H-2 collisions. The present result indicates the
applicability of the sudden approximation to CID in general cases of h
eavier diatomic or polyatomic molecules.