A many-body perturbation theory (MBPT) calculation is carried out to estimate quantitatively the effect of the many-body interaction on the photoionisation from the excited 3p state of neon. The authors calculation has shown that the many-body effect is relatively small (less than 15%) in the energy region where the photoionisation cross section is significant (i.e. 1 Mb or greater).
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T. N. Chang (1982) studied this question.
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