Abstract
For initially bare and hydrogen-like uranium ions (U92+ and U91+, respectively) a drastic difference in the emission characteristics is observed for the corresponding Ly-α1 and K-α1 cascade photons after radiative electron capture (REC) into the L shell of the projectile. Whereas the Ly-α1 x-rays are emitted preferentially perpendicular to the ion flight direction, the K-α1 photons show practically an isotropic emission pattern in the ion frame. Both, Ly-α2 and K-α2radiation are emitted isotropically with respect to the ion. Analytical calculations in lowest order for the L-REC—K-x-ray cascade process concur nicely with the experimental findings for the energy region investigated (70 - 300 MeV/u).
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