Revisiting electron-correlation effects on valence shake-up satellites of neon

Abstract

We report an electron momentum spectroscopy study on valence shake-up satellites of neon. A symmetric noncoplanar $(e,2e)$ experiment was performed at an incident electron energy of 1.2 keV, and the recoil-ion-momentum--dependent $(e,2e)$ cross sections or momentum profiles of the shake-up satellites have been obtained. Furthermore, theoretical momentum profiles have been calculated on the basis of the distorted-wave Born approximation using configuration interaction wave functions of the initial neutral and final ionic states. Comparison between experiment and theory has revealed that contrary to a general expectation, electron correlation in the initial neutral state has a significant influence on the shapes of momentum profiles for neon satellites. It has been shown that the Dyson orbitals of transitions to the $2{p}^{4}(^{1}\mathrm{S})3s\phantom{\rule{0.16em}{0ex}}^{2}\mathrm{S}$ and $2{p}^{4}(^{1}\mathrm{D})3p\phantom{\rule{0.16em}{0ex}}^{2}\mathrm{P}$ ionic states are more localized than those of the associated primary ionizations due to electron-correlation effects.