Study of proton and alpha particle impact double ionization of Fe

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 α_δE (cross section for energy transfer ΔE) 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.