ENERGY-MOMENTUM STRUCTURE OF THE KRYPTON VALENCE SHELL BY ELECTRON-MOMENTUM SPECTROSCOPY

Momentum distributions and spectroscopic factors are obtained in a hig h-resolution electron-momentum spectroscopy study of krypton at 1000 e V. The shapes and relative magnitudes of the momentum profiles are in good agreement with the results of calculations made within the distor ted-wave impulse approximation (DWIA) framework. The DWIA describes th e relative magnitudes of the 4p and 4s manifolds as well as giving a g ood representation of the shapes of the respective 4p and 4s cross sec tions. Results for the momentum profiles belonging to excited P-2(o) a nd S-2(e) manifolds are also presented. Spectroscopic factors for tran sitions belonging to the P-2(o) and S-2(e) manifolds are assigned up t o a binding energy of 42 eV. The spectroscopic factor for the lowest 4 s transition is 0.51+/-0.01, whereas that for the ground-state 4p tran sition is 0.98+/-0.01. Comparisons of the present binding energies and spectroscopic factors are made against the results of several many-bo dy calculations and photoelectron spectroscopy results. In addition, w e outline a procedure, utilizing the experimental 4p and 4s manifold c ross sections, that provides information on possible initial-state con figuration-interaction effects in krypton.