Semiclassical-quantal approach to the near-threshold ionization of hydrogen

Abstract

A recent improved version of the semiclassical-quantal approach has been applied to the ${e}^{\ensuremath{-}}\ensuremath{-}\mathrm{H}$ near-threshold ionization for ${\ensuremath{\theta}}_{12}=180\ifmmode^\circ\else\textdegree\fi{}$ geometry. It is found, that unlike other sophisticated theoretical methods such as distorted wave theory or convergent close-coupling calculation, the present relatively simpler approach produces correct behavior and numerical values for the triple-differential cross sections. We compare our results with recent absolute measurements and accurate numerical calculations at 2 eV and 4 eV above the threshold at constant ${\ensuremath{\theta}}_{12}$ geometry.