Variations in asymmetry parameter, beta , and the ratio of partial photoionisation cross sections sigma ( 2 P 3 2/): sigma ( 2 P 1 2/) have been determined in the region of the 3s3p 6 4p 1 P 1 0 resonance in Ar and the 5s5p 6 6p 1 P 1 0 resonance in Xe. In both cases there is a considerable variation in beta through the resonance. In Ar the beta values for the spin-orbit components are similar; in Xe they are significantly different. In Xe, the branching ratio shows a modest variation through the resonance, whereas in Ar no noticeable change occurs.
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Codling et al. (1980) studied this question.
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