Abstract
We examine correlations in high-energy photoeffect, utilizing a perturbative treatment of the effects beyond the independent particle approximation (IPA) in the high-energy photoionization of states with arbitrary values of the angular momenta $\ensuremath{\ell}$. The dominant mechanism of IPA breaking is discussed. The dependence of IPA breaking contributions on the parameters $1∕Z$ and $\ensuremath{\alpha}Z$ is analyzed. In the general case the amplitude is expressed as a linear combination of IPA amplitudes. The development of precise experiments, together with the demonstration that there is substantial cancellation among the nonrelativistic partial correlations amplitudes in many cases, particularly for ground-state atoms, makes a relativistic approach to the problem desirable, even at relatively low values of photon energy.
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