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A: Fachverband Atomphysik
A 33: Poster Session II
A 33.20: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal
A new calibration standard for X-ray light sources — •Steffen Kühn1, Sven Bernitt2, Peter Micke3, René Steinbrügge4, and José Ramon Crespo López-Urrutia1 — 1Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — 2Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, 07743 Jena, Germany — 3Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany — 4Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22607 Hamburg, Germany
In the last decade X-ray laser spectroscopy has been proven to be a reliable technique to investigate atomic transitions of highly charged ions with highest precision by measuring the fluorescence of an ion cloud following the resonant excitation by a brilliant, monoenergetic photon beam provided by synchrotrons or free-electron lasers. We developed a new setup in which the highly charged ions are produced and stored in an electron beam ion trap (EBIT) that employs a novel off-axis electron gun with optical access along the beam axis. This allows an in-situ usage of the ion cloud to resonantly photoexcite well-known inner-shell atomic transitions and thus calibrate the photon beam energy with highest accuracy. Here we present first results of a calibration of the U49-2_PGM beam line at BESSY II in Berlin. The calibrated photon beam was used to investigate the absorption spectra of different molecular gases, which are crucial for the interpretation of X-ray satellite observations.