Coplanar asymmetric (e,2e) experiments on xenon 4d and 5p orbitals.

Abstract

Relative triple-differential cross sections for ionization of Xe 4[ital d] and 5[ital p] orbitals have been measured in coplanar asymmetric kinematics. The scattered-electron energy is held at 1000 eV while the ejected-electron energy is changed so as to select energy-loss values [Delta][ital E] in or out of the region characterized by the giant resonance in the 4[ital d][r arrow][var epsilon][ital f] channel. The ionization mechanism as well as the interference between the direct and resonant processes have been investigated by varying the momentum transfer in a collision at each ejected-electron energy. Strong interchannel coupling between the 5[ital p] and 4[ital d] shells in the region of the giant resonance has been observed in ([ital e],2[ital e]) experiments. Distorted-wave-Born-approximation calculations have been compared with the experimental triple-differential cross section and used to guide the discussion.