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Breakdown of the Independent Particle Approximation in High-Energy Photoionization

Abstract

The independent particle approximation is shown to break down for the photoionization of both inner and outer nl \(l>0\) electrons of all atoms, at high enough energy, owing to interchannel interactions with the nearby ns photoionization channels. The effect is illustrated for Ne 2p in the 1 keV photon energy range through a comparison of theory and experiment. The implications for x-ray photoelectron spectroscopy of molecules and condensed matter are discussed.

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