Photoelectron angular distributions for resonantly enhanced three-photon ionization (2+1) of cesium via the ns (n=8--12) states have been measured. The asymmetry parameter {β} is found to vary from +1.2 for the 8s state to -0.5 for the 12s state. These results provide the first clear experimental evidence for relativistic (spin-orbit) effects on the photoelectron angular distribution for an alkali-metal atom.
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Cuéllar et al. (1990) studied this question.
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