Triple differential cross-section measurements forKr(3d)electron-impact ionization

Abstract

Triple differential cross sections have been measured for the electron-impact ionization of the $3d$ orbital of krypton. The measurements have been performed in asymmetric coplanar geometry at incident energies around 1 keV, and ejected electron energies of 72 eV (corresponding to bound Bethe ridge conditions) and 50 eV. Both of these energies are significantly below the binding energy of the $3d$ orbital of approximately 94 eV. The measured cross sections are compared with calculations performed in the distorted-wave Born approximation and the distorted-wave impulse approximation. There is quite good agreement in the former case, but no agreement in the latter, despite kinematics which should emphasize the impulsive nature of the collision.