S B Whitfield et al 2006 J. Phys. B: At. Mol. Opt. Phys. 39 L335 doi:10.1088/0953-4075/39/21/L01
S B Whitfield1, R Wehlitz2, H R Varma3, T Banerjee3, P C Deshmukh3 and S T Manson4
Show affiliationsWe investigate the case of resonance-induced deviations of the angular distribution anisotropy parameter, β, from its nominal value of 2.0 for the Kr 4s-subshell at the 3d → mp(m ≥ 5) excitations and the Xe 5s-subshell in the region of the 4d → mp(m ≥ 6) excitations. We observe small but unmistakable variations of β from 2.0 at these resonances. In the case of Kr the largest deviation from 2.0 is a mere −0.030(6), β4s = 1.970(6), while in Xe it is definitively larger at −0.080(6), β5s = 1.920(6). To understand these results in more detail, we have carried out relativistic random phase and relativistic multi-channel quantum defect calculations. Our theoretical results clearly indicate deviations of β from 2.0 for these photolines in these resonance regions, although the degree of variation is predicted to be larger than what is observed.
32.80.Fb Photoionization of atoms and ions
31.30.J- Relativistic and quantum electrodynamic (QED) effects in atoms, molecules, and ions
Issue 21 (14 November 2006)
Received 7 September 2006, in final form 21 September 2006
Published 17 October 2006
S B Whitfield et al 2006 J. Phys. B: At. Mol. Opt. Phys. 39 L335
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