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A new and explicitly many-body aspect of the "leveraging" of the spin-orbit interaction is demonstrated, spin-orbit activated interchannel coupling, which can significantly alter the photoionization cross section of a spin-orbit doublet. As an example, it is demonstrated via a modified version of the spin-polarized random phase approximation with exchange, that a recently observed unexplained structure in the Xe 3d(5/2) photoionization cross section [A. Kivimäki et al., Phys. Rev. A 63, 012716 (2000)] is entirely due to this effect. Similar features are predicted for Cs 3d(5/2) and Ba 3d(5/2).

A. Multielectron Correlation Effects in Collisions A.1. Probing Correlations through Spin-Orbit InteractionRecently, a new aspect of interchannel coupling has been found [1], known as spin-orbit activated interchannel coupling, stimulated by an experimental study on photoionization of Xe in the vicinity of the 3d threshold. This effect results only through the spin-orbit splitting of innershell thresholds. Effects of spin-orbit activated interchannel coupling on nondipole [2] photoelectron angular distribution asymmetry parameters have been discussed, including the spin-polarization of photoelectrons from 3d electrons of Xe, Cs and Ba, concluding that through spin-orbit interaction polarization can be achieved and correlation probed.Public reporting burden for this collection of information is estimated to average 1 hour per response, including ii is, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send'