Classical Trajectory Calculations of Collision Energy Dependence of Partial Penning Ionization Cross Sections for He*(23S) + CH3CN → He + CH3CN++ e-

Abstract

Classical trajectory calculations are performed for the Penning ionization system He*(23S) + CH3CN → He(11S) + CH3CN+ + e-. Anisotropic model potentials of He*(23S) + CH3CN are adopted to calculate the partial ionization cross sections for the ionic states, X12E, A12A1, B22E, and C22A1. Results of the calculations are compared with experimental collision energy dependence of partial ionization cross sections. Analyses of opacity functions indicate the attractive characteristics of the anisotropic interaction potential for the X and A states, the repulsive nature for the B state, and the transition from the attractive to the repulsive features for the C state.