Electron correlation effects in the (e, 2e) valence separation energy spectra of krypton

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Abstract
Separation energy and momentum distributions for the valence orbitals of krypton have been obtained at a total electron energy of 1200 eV using (e, 2e) spectroscopy with symmetric kinematics. The spectroscopic strength of the 4s orbital is found to be significantly split among ion states ranging into the continuum, whereas the spectroscopic strength of the 4p ground-state transition is found to be essentially unity. The momentum distributions for the 4p-1 and 4s-1 transitions are well described by the corresponding Hartree-Fock ground-state orbital momentum distribution. A number of configuration interaction calculations, using predominantly the 4s4p6 and 4s24d(2S12/) configurations, have been carried out for the main 4s-1 ion eigenstates. The results although confirming severe splitting of the 4s-1 spectroscopic strength, overestimate the 4s4p6 component of the lowest 2S level in the ion. The data provide a sensitive test of the variational determination of the parameters of pseudostates representing configurations not treated explicitly.

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