EXCITATION OF AUTOIONIZING STATES OF HELIUM BY PROTON AND ANTIPROTON IMPACT

A method for evaluating the excitation by particles of charge Z(p) of autoionizing states of helium is presented which includes interference with degenerate single ionization continuum states both before and af ter excitation. The decay into the final continuum state may be influe nced by Coulomb interaction with the projectile in the final state. Th ese effects influence the Z(p)(3) terms which may be observed experime ntally. Calculations using this method are presented and compared with other calculations and experimental data.