Abstract
Inner-shell ionization of xenon $4d$ electrons have been studied by the binary $(e,2e)$ spectroscopy at the impact energies of 1200, 1600, and $2400\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. Experimental energy-momentum densities and the impact-energy dependence of momentum distributions of $4{d}_{5∕2}$ and $4{d}_{3∕2}$ are reported, the results are compared with the distorted-wave impulse approximation and the distorted-wave Born approximation. Moreover, the cross-section ratios of $4{d}_{5∕2}$ to $4{d}_{3∕2}$ are further provided at these different impact energies, which clearly manifest the relativistic effects. Some similarities and dissimilarities are observed on the impact-energy dependence of momentum distributions of $4{d}_{5∕2}$ and $4{d}_{3∕2}$ states and their cross-section ratios.
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