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 β3d for Xe, Cs and Ba are explored using a modified version of the spin-polarized random phase approximation with exchange (SPRPAE) methodology. For Xe, β3d5/2 is modified somewhat by the interchannel coupling in the vicinity of the 3d3/2 → εf 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 β3d5/2 above the 3d3/2 threshold is negligible. But below the 3d3/2 threshold, β3d5/2 is dominated by the huge broad 3d3/2 → 4f resonance