Abstract
Random phase approximation calculations for photoionization of an open-shell atom have been carried out for atomic chlorine. Virtual double excitations in the ground state, which influence rare gas photoabsorption cross sections significantly, do not play as important a role in atomic chlorine due to an averaging out of these effects among many final state channels. Photoelectron angular distributions have been calculated for the outer (open) shells of the halogens and the chalcogens and it is found that anisotropic electron-ion interactions are strongest in the second row of the periodic table. Measurements of photoelectron branching ratios across an autoionizing resonance were carried out at the Tantalus 1 storage ring at Stoughton, Wisconsin. The /sup 2/P/sub 3/2/: /sup 2/P/sub 1/2/ photoelectron branching ratio in xenon was found to vary dramatically across the Xe5s5p/sup 6/6P(/sup 1/P/sub 1/) autoionizing resonance indicating the importance of electron correlation and spin-orbit interaction in small energy regions. The data were fitted very well by a new theoretical formula derived by Starace.
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