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.
Atomic, Molecular and Optical Physics | Physical Chemistry
Copyright American Physical Society. Used with permission.
Dias, E. W.,
Chakraborty, H. S.,
Deshmukh, P. C.,
Manson, S. T.,
Whitfield, S. B.,
Lindle, D. W.,
Levin, J. C.,
Sellin, I. A.
Breakdown of the Independent Particle Approximation in High-Energy Photoionization.
Physical review letters, 78(24),