Inelastic collisions

Abstract

In contrast to the three preceding articles consideration is given to certain aspects of inelastic collisions. The semi-empirical use of complex phase shifts to allow for the occurrence of such differences is first discussed and related to the concept of complex scattering potentials. Scattering by an absorbing sphere is then eonsidered and shown to involve elastic shadow scattering. This is related to certain experimental results on the angular distribution of He+ ions scattered by Kr and Xe atoms. Complex phase shift analysis is then extended to collisions between H and H-in which both charge transfer and detachment may occur. A description is given of the experimental method used to measure these cross sections and of the relation of the observed results to the theory. Finally, a discussion of curve-crossing perturbations in elastic scattering and their relation to inelastic scattering is given. It is shown that these effects account for certain o6served phenomena in the elastic scattering of ions by atoms which were not cxplicable in terms of the analysis given in the second article.

Regge pole analysis of large angle elastic scattering in chemically reactive systems

“…Other theo:ies have also predicted oscillations in large angle scattering [1,6,[19][20][21][22][35][36][37][38][39][40]. In particular, Eu [21] numerically integrated the Schr6dinger equation for an assumed optical potential and Levine and Bernstein [19,20] parameterized the S matrix in equation (2) in various ways.…”

“…chemical reaction) of part of the incident beam [16][17][18][19][20][21][22][23][24][25]40]. It is shown below that the fourth quadrant is free from poles for complex potentials satisfying (5).…”