Systematic measurements of K-shell ionization by 3He ions of energy 0.6–3.6 MeV

Abstract

K-shell ionization cross sections for A1, P, Ar, Ti, Cr, Fe, Ni, Ge, Se, Nb and Pd were measured for incident 3He ions of energy 0.6–3.6 MeV. The experimental results were compared with the predictions of the existing theories of K-shell ionization by charged particles, i.e. the ECPSSR theory, the simplified SCA-model of Lægsgaard et al., the SCA calculations with approximate Andersen's recipe for the electron binding energy and, finally, the fully time-dependent SCA-FTD calculations of Trautmann and Kauer, which also use the Andersen's recipe for estimation of the binding energy, but in the time-dependent version. Good agreement is observed between the experimental data and the predictions of the ECPSSR theory. The fully time-dependent treatment of binding effect has essentially improved an agreement of the SCA calculations with experimental results for higher reduced velocities, but still there are discrepancies in the low-velocity region. On the other hand, the approximate Andersen's recipe simulates quite well the binding effect.