Angular distribution for the proton impact ionization of 3p-electrons in Ar

Using our recently published theoretical model for proton impact ionization of Ar [Phys. Rev. A68 052702 (2003)], we calculate here the double differential cross sections for the same system at various ejected electron energies and angle of ejection. Results are compared with available measurements and other calculated results. It is found that our results agree reasonably well with the measurement in the binary encounter region but slightly overestimate the measurement around the recoil peak. At 350 keV impact energy we have calculated double differential cross sections for outgoing electron energies at (a) 46 eV, (b) 100 eV and (c) 308 eV All three cases exhibit similar behaviour.