Quantum calculations of multistructure cross-sections for the Ca(4s5p, 3 P 2 ← 1 P 1 ) + He collisional process

Transitions between the magnetic sublevels of the Ca atom in the 4s5p Rydberg state induced by collision with He(S-1) are studied by the quantum close-coupled method. Multistructure cross-sections, of both conventional and coherence types, are calculated for the spin-changing transition P-3(2) <-- P-1(1) Scattering calculations are based on a model Ca-He interaction as well as an ab initio approach and are related to the conditions of the recent three-vector correlation experiment of Smith, Ch. J., Driessen, J.P.J., Eno, L., and Leone, S. R., 1992, J. chem. Phys., 96, 8212, in which the alignment selected 3P <-- 1P cross-sections were determined. Fairly good qualitative agreement has been found for the relative values of the cross-sections considered.