Berlin 2014 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 16: Atomic clusters (with A)
MO 16.1: Hauptvortrag
Donnerstag, 20. März 2014, 10:30–11:00, BEBEL E44/46
Unusual electron dynamics in He clusters induced by intense XUV pulses — •Yevheniy Ovcharenko1, Aaron LaForge2, Victor Lyamayev3, Raphael Katzy2, Patrick O'Keeffe4, Oksana Plekan5, Paola Finetti5, Robert Richter5, Kevin Prince5, Marcel Drabbels6, Carlo Callegari5, Frank Stienkemeier2, and Thomas Möller1 — 1IOAP, TU-Berlin, Germany — 2Physikalisches Institut, Universität Freiburg, Germany — 3European XFEL, Hamburg, Germany — 4CNR IMIP, Monterotondo Scalo, Italy — 5Elettra-Sincrotrone Trieste, Basovizza, Italy — 6EPFL, Lausanne, Switzerland
The investigation of complex atomic and molecular systems in intense IR and XUV pulses has attracted considerable attention during the last decade, since it leads to a better understanding of light matter interaction. Recently, the first seeded Free Electron Laser FERMI became available for users and now offers unique possibility to perform detailed investigations in such systems due to the narrow bandwidth, fine energy tunability and high intensity in XUV energy range. By using this new source the ionization dynamics in He clusters has been explored with electron spectroscopy in a wide energy range. In addition to the conventional sequential multi-step ionization with a photon energy well above the first ionization potential (IP) a novel ionization process following resonant excitation below IP was observed. It is due to autoionization of two or more electronically excited cluster atoms as predicted recently [1]. The process is very efficient and can exceed the rate of direct photoionization above IP.[1] A.I. Kuleff et al., PRL 105, 043004 (2010)