Quantum studies of alignment effects in the Ba(6s6p, P-3(2) <- P-1(1) inelastic transition induced by helium

The quantum close-coupling studies of the P-3(2) <-- P-1(1) spin-changing t ransitions in Ba(6s6p) colliding with helium involving changes of magnetic quantum numbers are presented. The cross-sections are calculated using the theoretical potential curves of E. Czuchaj et al. [1995, Chem. Phys. Lett., 196, 37]. A description of the characteristic features of the multi-struct ure cross-sections, particularly their dependence on various aspects of col lision dynamics is given. The study of orientation, alignment and coherence effects is made in a range of relative translational energies from thresho ld to 2.0 eV. The calculated multi-structure cross-sections are averaged ov er a Maxwell-Boltzmann distribution of collision energy.