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A: Fachverband Atomphysik

A 23: Poster II

A 23.16: Poster

Donnerstag, 11. März 2010, 16:30–19:00, Lichthof

Investigations of Excitation Processes in Stored Highly Charged Ions — •D. B. Thorn, A. Gumberidze, S. Trotsenko, N. Petridis, R. Grisenti, C. Kozhuharov, G. Weber, U. Spillmann, Th. Stoehlker, A. Surzhykov, D. F. A. Winters, S. Geyer, R. Maertin, M. Trassinelli, D. Banas, D. Yu, W. Chen, N. Winters, R. Reuschl, S. Hess, M. Hegewald, A. Simon, R. Dubois, and H. Beyer — Work performed at GSI-Darmstadt. See poster for Affiliation information.

Electron- and proton-impact excitation (EIE and PIE) of bound electrons are among some of the most fundamental spectral line formation processes in the universe. In highly charged high-Z ions these two processes are in principle similar (a coulomb field excites the electron), except that EIE is characterized by a sharp threshold, which is not present in PIE because of the much larger momentum transfer possible between a proton and an electron. Furthermore, QED is predicted to affect the EIE process while the PIE process is left untouched. Previously, there have been no EIE measurements done at heavy ion storage rings and so all previous experiments were either carried out at electron beam ion trap facilities or fusion plasma facilities. At GSI we have made use of the experimental storage ring (ESR) to make studies of EIE and PIE of K-shell transitions in stored hydrogenlike uranium ions during collisions with neutral gas atoms. In this poster we describe a novel approach that utilizes a cryogenically cooled liquid microjet source to differentiate the two processes.