Observation ofKx rays from highly ionized states of neon produced by 40-MeVCl+7,Cl+11, andCl+13beams

The $K$ x-ray transitions of neon produced in single collisions of 40-MeV ${\mathrm{Cl}}^{+7\mathrm{}}$, ${\mathrm{Cl}}^{+11\mathrm{}}$, and ${\mathrm{Cl}}^{+13\mathrm{}}$ beams with neon targets are resolved into eight components. Over half the x-ray production is found to be associated with the two- and three-electron system in all cases. Strongly charge-dependent neon $\mathrm{Ly}-\alpha$ production is also observed. X-ray and vacancy-production cross sections are obtained for each component separately. We show that the vacancy-production cross section rather than the change in fluorescence yield dominates the charge dependence of the x-ray yields.