Düsseldorf 2007 – scientific programme
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MO: Fachverband Molekülphysik
MO 62: Collisions with electrons and ions (gemeinsam mit A)
MO 62.1: Invited Talk
Friday, March 23, 2007, 10:30–11:00, 5M
Angular analysis of x–ray emission from excited ionic states with unresolved fine structure — •Andrey Surzhykov1, Ulrich Jentschura1, Thomas Stöhlker2, and Stephan Fritzsche3 — 1Max–Planck–Institut für Kernphysik, Heidelberg — 2Gesellschaft für Schwerionenforschung (GSI), Darmstadt — 3Universität Kassel
At storage rings, the various processes occurring in relativistic collisions of heavy ions with atomic or electronic targets may result in the production of excited ionic states. The subsequent decay of these excited states leads to emission of one (or several) photons until the ground state is reached. The angular analysis of such a characteristic x-ray emission is a valuable tool for studying the structure and dynamics of highly-charged ions. Quite often, however, the decay photons from two (or more) excited ionic states cannot be distinguished by x-ray detectors and, hence, only “averaged” angular information is available from experiment. In this contribution, we present a theoretical study for the angular distributions of the unresolved characteristic lines and argue that even the “averaged” emission patterns may help us to understand the population–and–decay of high-Z ions. As an example, we present our calculations for the Kα1 decay of the excited 1s 2p3/2 J = 1, 2 states of the helium–like uranium ions U90+ produced in the course of two different population processes: (i) the radiative electron capture and (ii) the Coulomb excitation. Experiments concerning these processes have recently been performed at GSI in Darmstadt, and the angular distributions observed have been found to be inconsistent with the predictions of a one–particle model.
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