Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 11: Interaction with VUV and X-Ray Light I
A 11.2: Vortrag
Mittwoch, 10. März 2010, 10:45–11:00, B 302
Two-Photon Inner Shell Ionization in the Extreme-Ultraviolet — •Vincent Richardson1, John T. Costello1, Denis Cubaynes2, Stefan Düsterer3, Josef Feldhaus3, Hugo van der Hart4, Pavle Juranic3, Wenbin Li3, Michael Meyer2, Mathias Richter5, Andrey A. Sorokin3,5,6, and Kai Tiedtke3 — 1National Centre for Plasma Science and Technology, Dublin City University, Dublin 9, Ireland — 2LIXAM/CNRS, Centre Universitaire Paris-Sud, Bâtiment 350, 91405 Orsay Cedex, France — 3Deutsches Elektronen-Synchrotron, DESY, Notkestrasse 85, 22603 Hamburg, Germany — 4Dept. of Appl. Mathematics and Theoretical Physics, David Bates Bldg., Queen's University Belfast — 5Physikalisch-Technische Bundesanstalt, PTB, Abbestraße 2-12, 10587 Berlin, Germany — 6Ioffe Physico-Technical Institute, Polytekhnicheskaya 26, 194021 St. Petersburg, Russia
We have observed the simultaneous inner-shell absorption of two extreme-ultraviolet (EUV) photons by a Xe atom in an experiment performed at the short-wavelength free-electron laser (FEL) facility FLASH in Hamburg. Photoelectron measurements permitted us to unambiguously identify a feature resulting from the single ionization of the 4d sub-shell of Xe by two photons each of energy 93 eV. In addition, we were able to track its intensity dependence which varies quadratically with the pulse energy. The results are discussed and interpreted within the framework of recent results of ion spectroscopy on Xe obtained at ultra-high EUV irradiance (PRL 99 (2007) 213002; PRL 102 (2009) 163002).