Magnetic transitions in the initial-l labeled interpretation of the CS approximation. Computations for He+HCl

Abstract

Calculations of Arthurs–Dalgarno space frame differential and integral cross sections for intermultiplet transitions, quantized with respect to the incident rotational angular momentum, are carried out for He + HCl collisions using the initial-l labeled version of the coupled states (CS-li) method given recently by Khare. Comparisons with accurate close coupling results of Monchick are made and the CS-li results for integral polarization cross sections are found to be at least semiquantitative, with the best agreement occurring for inelastic j0→j, and for m0≠m collisions. Elastic depolarization differential cross sections 𝒥m(dσ/dΩ)(j0m0→jm) are most accurate in the forward and backward directions, while the inelastic cross sections 𝒥m(dσ/dΩ)(j0m0→jm) are accurate only in the backward direction. In the midangular region, the magnitudes of the depolarization cross sections are inverted so that those starting from m0=0 are too large, and those with increasing initial m0 are too small.