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Distorted-wave calculations of the triply differential cross sections for electron-impact ionization of H, He, Ne, Ar, Kr, and Xe are presented for final-state electrons sharing {le}4 eV excess energy and for the coplanar, {theta}{sub 12}={pi} geometry. Results for H and He targets, presented briefly elsewhere (C. Pan and A. F. Starace, Phys. Rev. Lett. 67, 185 (1991)), are analyzed in greater detail and compared with available experimental and other theoretical results. In particular, for He targets the effects of exchange and of second-order capture processes are exhibited. These are shown to be of lesser importance than other short-range effects on the {ital s}-wave phase shifts of both incident and final-state continuum electrons for reproducing the experimentally observed target dependence of the electron angular distributions for H and He targets (P. Schlemmer, T. Roesel, K. Jung, and H. Ehrhardt, Phys. Rev. Lett. 63, 252 (1989)). More approximate theoretical ({ital e},2{ital e}) results for Ne, Ar, Kr, and Xe targets also show striking target dependences; they are compared with available experimental results.

Angular distributions for near-threshold (e,2e) processes for H, He, and other rare-gas targets