Darmstadt 2008 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 13: Posters: Photoionization and atomic systems in external fields

A 13.1: Poster

Dienstag, 11. März 2008, 16:30–18:30, Poster C3

Photoionization of highly charged ions — •Martin C. Simon, Sascha W. Epp, Thomas M. Baumann, José R. Crespo López-Urrutia, and Joachim Ullrich — Max-Planck Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany

Photoionization counts to the essential processes of light-matter interaction. For such experiments sufficiently high photon flux and target densities have to be provided. While cross-sections for atoms were already measured during the middle of the last century, the first measurements on singly charged ions started only about two decades ago. There are a few results on multiply chared ions but so far HCIs (highly charged ions) could not be studied. In principle an EBIT (electron beam ion trap) can provide a sufficiently high HCI density but the required photon energies increase strongly with the charge state of the ion. Combined with the demand of high flux this type of experiments are restricted to modern light sources like fourth-generation synchrotrons and soft X-ray FELs (free electron lasers). With a transportable cryogenic EBIT it was recently possible for the first time to perform resonant laser spectroscopy on highly charged iron ions at the FEL in Hamburg (S. W. Epp et al. PRL 98). This EBIT is now equipped with an extraction system in order to measure photoionization by the detection of extracted ions. First tests will be performed at the FEL in Hamburg in March 2008 and further studies will take place at the Berliner electron storage ring synchrotron BESSY in June 2008.