Triple differential cross sections for ionization of helium-like lithium by electron impact

Abstract

Triple differential cross sections (TDCS) have been calculated for ionization of helium-like lithium ions (Li+) by fast electron impact in the asymmetric geometry. The correlated final state wavefunction in the present model satisfies the asymptotic three-body boundary condition. The initial channel wavefunction involves a Coulomb wavefunction due to the long range Coulomb attraction between the incident electron and the screened ionic nucleus. TDCS results have been computed For three different incident energies: 250 eV, 500 eV and 1000 eV for fixed values of the ejected energies (5 eV and 10 eV) and scattering angles (4 degrees and 10 degrees ). An intense recoil peak (even larger than the binary one for low momentum transfer) is noted in the TDCS structure at lower incident energies. The binary to recoil ratio (b/r) is studied against the momentum transfer (q).