Photon-electron polarization correlations in high-Z ns-subshell photoionization

We present a comprehensive survey of the behavior of all correlations Cij between the polarization of the incoming photon and the spin of the outgoing photoelectron, for ejection from all subshells of uranium, for electron energies from 1 eV to 100 keV. The correlations for ns-subshell photoionization are reported here. The numerical results for these polarization correlations are obtained within the independent-particle approximation in a relativistic self-consistent atomic field (Dirac-Slater type), including all significant multipole contributions. We confirm that at low photon energies (up to ∼1 keV), which means relatively low kinetic energy var-epsilon for the photoelectron and ejection from a subshell of high n, dipole predictions are generally valid, reproducing the full numerical results, including the abrupt changes in the shape of the Cij curves as functions of the ejection angle θ. As photon energy increases, the correlation coefficients become complicated functions of θ, losing symmetry around θ=90 degree. For higher var-epsilon, the correlation coefficients of different n tend to merge into a common curve as a function of θ, although the shape of the curve keeps changing as var-epsilon increases, as we have previously reported for angular distributions