Photon-electron polarization correlations in highnp[sub J]-subshell photoionizat
- Department of Physics, Myong-Ji University, Yong-In 449-728 (Korea, Republic of)
- Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904 (Israel)
- Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (United States)
A comprehensive survey is presented of the behavior of all correlations [ital C][sub [ital i][ital j]] between the polarization of the incoming photon and the spin of the outgoing photoelectron, for ejection from all [ital np][sub [ital J]] subshells of uranium for photoelectron energies ranging from 1 eV to 100 keV. The numerical results for these polarization correlations are obtained within the independent-particle approximation in a relativistic self-consistent atomic field. At low photon energies the dipole predictions are generally valid, predicting large degrees of spin polarization of photoelectrons down to the threshold for all [ital np][sub [ital J]] subshells with a specific [ital J], even for the outer shells where the spin-orbit coupling is weak. At some energies where the dipole correlations vanish, deviations from dipole predictions may be visible even at low photon energies. As the photon energy grows higher, multipoles eventually dominate and the dipole-type symmetry in the ejection angle is lost, while the curves of a given correlation for the initial states with the same total and orbital angular momenta and different [ital n] merge into a common curve. We also discuss the comparison with the usual nonrelativistic dipole limit, in which summing over the [ital J]=1/2 and [ital J]=3/2 substates results in [ital np] photoionization with no spin polarization. In the relativistic case the spin-orbit effects, magnified in the differences in the positions of Cooper minima for the outer shells at low energies, lead to finite spin polarization of photoelectrons even after summing over [ital J].
- OSTI ID:
- 7061555
- Journal Information:
- Physical Review A; (United States), Vol. 51:1; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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