Effects of spin-orbit activated interchannel coupling on dipole photoelectron angular distribution asymmetry parameters

The effects of spin-orbit induced interchannel coupling on the dipole photoelectron angular asymmetry parameter beta(3d) for Xe, Cs and Ba are explored using a modified version of the spin-polarized random phase approximation with exchange (SPRPAE) methodology. For Xe, beta3d(5/2) is modified somewhat by the interchannel coupling in the vicinity of the 3d(3/2) --> epsilonf shape resonance, and this effect is significantly more pronounced in Cs where the resonance is larger. In Ba, however, where f-wave orbital collapse has occurred, the shape resonance has moved below threshold and the effect of interchannel coupling on beta3d(5/2) above the 3d(3/2) threshold is negligible. But below the 3d(3/2) threshold, beta3d(5/2) is dominated by the huge broad 3d(3/2) --> 4f resonance.