Absolute cross sections with polarization effects inNe*(2p53p)+Hecollisions: A detailed comparison between theory and experiment

Abstract

Quantal calculations are presented for intramultiplet mixing collisions of ${\mathrm{Ne}}^{*}{(2p}^{5}3p)$ with $\mathrm{He}{(}^{1}{S}_{0})$ in the 60--1250 meV collision energy range. The coupled equations are solved in a diabatic representation where the coupling terms are obtained using the model potential calculations of Hennecart and Masnou-Seeuws [J. Phys. B 18, 657 (1985)] for the interaction of the ${\mathrm{Ne}}^{*}$ outer electron with the two cores and values fitted on the spectroscopic data of Dabrowski and Herzberg [Mol. Spectrosc. 73, 183 (1978)] for the core-core interaction. An extensive comparison with the experimental data of the Eindhoven group is presented for absolute polarized cross sections and anisotropy parameters. Very good agreement is obtained with thermal energy data of Manders et al. [Phys. Rev. A 39, 4467 (1989)], while the systematic 30--40 % discrepancy with superthermal data of Boom et al. [Phys. Rev. A 49, 4660 (1994)] might be attributed to a calibration problem in the experiment rather than to an inaccuracy in the long-range potentials.