Hamburg 2009 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 15: Poster I

A 15.8: Poster

Dienstag, 3. März 2009, 16:30–19:00, VMP 9 Poster

Fluorescence cascades in Xe II after autoionization of doubly excited neutral Xenon — •Witoslaw Kielich¹, Pascal Kerdelhué¹, Philipp Reiß¹, Irina Haar¹, Rainer Hentges¹, Philipp V. Demekhin^1,2, Ivan D. Petrov², Viktor L. Sukhorukov², and Arno Ehresmann¹ — ¹Institute of Physics University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany — ²Rostov State University of Transport and Communications, 344038 Rostov-on-Don, Russia

Excitation of two-electron states in rare gas atoms with narrowband synchrotron radiation provides information for the analysis of electron interaction in atomic shells. The 5s/5p Xenon valence electrons, at room temperature and with a target cell pressure of 53.3µbar, were excited to doubly excited states in the energy range between 26.15eV and 26.35eV. They autoionize and populate singly ionized Xenon states which decay through a two step fluorescence cascade with the first decay in the visible spectral range and the second in the vacuum-ultraviolet. The florescence cascades were measured using the photon-induced fluorescence spectroscopy (PIFS) technique after extreme narrowband excitation at the BESSY II U125/2 10m-NIM beamline. The obtained partial fluorescence cross sections are analyzed in respect of their dependence as function of the exciting-photon energy.