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

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 recoilion-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 2p(4)(S-1)3s(2)S and 2p(4)(D-1)3p(2)P ionic states are more localized than those of the associated primary ionizations due to electron-correlation effects.