Abstract
Dirac-Fock calculations of the photoionization of the outer electrons in Na, K, Rb, and Cs have been performed. The resulting photoelectron angular distribution asymmetry parameters show strong variations with energy, in contrast to the nonrelativistic prediction of , independent of energy, for electrons. This deviation is due to the spin-orbit interaction of the continuum electron which gives rise to two final states and , in place of the single nonrelativistically. The transitions to the and have matrix elements and phase shifts which differ and interfere, thereby resulting in an energy-dependent . The effects are particularly dramatic between the Cooper minima in the two channels, and they persist even for as low as that for Na.
- Received 6 July 1979
DOI:https://doi.org/10.1103/PhysRevA.20.2364
©1979 American Physical Society