Abstract
We probe the energy-loss enhancement in preequilibration and the charge-equilibration time for highly charged Xe ions $({q}_{\mathrm{in}}=15--26)$ at near-Bohr velocity impinging on an Al target by measuring the dependence of the Xe $L$-shell x-ray yield on the initial charge state of the ions. The present results are found to be very consistent with those obtained in ion-transmission thin-foil experiments. The charge-equilibrium time is measured in the near-Bohr velocity region of highly charged ions in solids. Moreover, for the present collision system it is demonstrated by measuring the inner-shell x rays that the ionization of the inner-shell electrons of the projectile ions starts to contribute to ion energy loss at near-Bohr velocity.
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