Energy-Momentum Structure Of The Krypton Valence Shell By Electron-Momentum Spectroscopy

Momentum distributions and spectroscopic factors are obtained in a high-resolution electron-momentum spectroscopy study of krypton at 1000 eV. The shapes and relative magnitudes of the momentum profiles are in good agreement with the results of calculations made within the distorted-wave impulse approximation (DWIA) framework. The DWIA describes the relative magnitudes of the 4p and 4s manifolds as well as giving a good representation of the shapes of the respective 4p and 4s cross sections. Results for the momentum profiles belonging to excited P-2(o) and S-2(e) manifolds are also presented. Spectroscopic factors for transitions belonging to the P-2(o) and S-2(e) manifolds are assigned up to a binding energy of 42 eV. The spectroscopic factor for the lowest 4s transition is 0.51+/-0.01, whereas that for the ground-state 4p transition is 0.98+/-0.01. Comparisons of the present binding energies and spectroscopic factors are made against the results of several many-body calculations and photoelectron spectroscopy results. In addition, we outline a procedure, utilizing the experimental 4p and 4s manifold cross sections, that provides information on possible initial-state configuration-interaction effects in krypton.