Strong nondipole effects in low-energy photoionization of the 5s and 5p subshells of xenon
Large nondipole effects are predicted in the angular distribution of photoelectrons from the 5s and 5p subshells of xenon for photon energies below 200 eV. The nondipole parameter {gamma}{sub 5s} exhibits a dispersion-curve variation near the first minimum of the 5s cross section at 35 eV, reaching a minimum value of -0.8 near 40 eV. Rapid variation of {gamma}{sub 5s} is also found near the second minimum of the 5s cross section at 150 eV, where {gamma}{sub 5s} reaches a maximum value of 1.2. Smaller, but significant, nondipole effects are also found in the parameter {zeta}{sub 5p}={gamma}{sub 5p}+3{delta}{sub 5p}, which has a maximum value of 0.15 near 50 eV, and a second maximum value of 0.18 near 160 eV. The higher energy maxima in {gamma}{sub 5s} and {zeta}{sub 5p} arise from correlation enhanced by shape resonances in the 4p{yields}f quadrupole photoionization channels. These predictions are based on relativistic random-phase approximation calculations in which excitations from 5p, 5s, 4d, 4p, and 4s subshells are coupled.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40206021
- Journal Information:
- Physical Review A, Vol. 63, Issue 2; Other Information: DOI: 10.1103/PhysRevA.63.022504; Othernumber: PLRAAN000063000002022504000001; 072101PRA; PBD: Feb 2001; ISSN 1050-2947
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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