Abstract
The asymmetry parameters of Ba 6p j ns ( j=1/2, 3/2 J=1) autoionizing states, which characterizes the angular distribution with the form ( σ/4 π)[1+ βP 2(cos θ)], have been investigated, using multichannel quantum defect theory, combined with R-matrix method. Furthermore, energy dependence of asymmetry parameters of electrons ejected from Ba 6p j ns autoionizing states to the 6s 1/2, 5d 3/2, 5d 5/2, and 6p 1/2 ion states has been studied. The results indicate the 6p 1/2ns and 6p 3/2ns series have different characteristics in their angular distributions of ejected electrons. Our theoretical results not only agree well with the previous experimental ones, but also predict some new phenomena.
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