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.
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