ENERGY AND ANGULAR MOMENTUM DISTRIBUTION OF ELECTRONS EMITTED FROM K AND L SHELLS BY PROTON IMPACT

Explicit expressions for the semiclassical transition probabilities of atomic K- and L-shell electrons into the continuum as a result of proton collisions are obtained as functions of proton-impact parameter and energy transfer, using first-order time-dependent perturbation theory with undeflected proton trajectories. Calculated energy distributions for the ejected electrons are compared with the plane-wave Born-approximation cross sections. The contributions from various partial waves are shown in illustrations. The validity of the calculation is limited by the neglect of the Coulomb deflection of the protons. © 1969 The American Physical Society.