Charge Dependence of TotalK-Shell Vacancy-Production Cross Sections in Argon by the Impact of Heavy Ions

Abstract

The charge dependence of $K$-shell-electron vacancy production in argon by heavy-ion impact is found by adding charge-exchange and ionization cross sections computed in the binary-encounter approximation. The dependence of these cross sections on the nuclear charge, for fully stripped ions ($z=6,7,8,\mathrm{and} 9$), is in agreement with recent experimental results at 1.88 MeV/amu, where large deviations (>100%) from a $z^2$ dependence were observed. The dependence of atomic charge $q$ for ${\mathrm{F}}^{+q}$ at 1.88 MeV/amu ($q=9,7,8,6,\mathrm{and} 5$) is in reasonable agreement with experiment.