Analysis of the ejected-electron spectra of Ar following controlled electron impact

Abstract

A systematic investigation of the ejected-electron spectra of Ar is reported for incident electron energies 25-300 eV. The positions of several singly- and doubly-excited autoionizing states in the energy range 25-54 eV have been measured and compared, where possible, with the results of other workers. Using a Rydberg-Ritz analysis, many higher unobserved members of the ns ¹S and ³S, np ¹P and ³P and nd ¹D series have been calculated. Evidence demonstrating the existence in certain instances of a strong post-collision interaction between the scattered and ejected electrons is presented and discussed.