Rearrangement effects in photoionization.
The recent developments and the physical backgrounds of the random phase approximation with exchange (RPAE) method are briefly discussed. The limitations of RPAE and the main features of a more general theory that would be free of RPAE difficulties are considered. The generalizations of RPAE are discussed that permit one to take into account the rearrangement of electron shells in the course of ionization and the effects due to the decay of the vacancy created in the ionization process. The role of the two-electron-two-hole virtual excitation is examined. The possibility is discussed of the existence of large amplitude electron density oscillations in atoms.
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