Study of proton and alpha particle impact double ionization of Fe

Abstract

Theoretical calculations of H⁺ and He²⁺ impact double ionization cross sections for ground state Fe atoms have been performed in the binary encounter approximation(BEA) in the energies region ranging from 80 to 1440 keV/amu for proton impact and  from 47  to 360 keV/amu in the case of alpha particle impact. The accurate expression for  (cross section for energy transfer ) and Hartree –Fock velocity distributions for the target electrons have been used throughout the calculations. It has been concluded that the calculated results of H⁺ and He²⁺ impact double ionization cross sections are in good agreement with the experimental data throughout the given energy range.