Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 5: Photoionization I

A 5.1: Hauptvortrag

Montag, 14. März 2011, 14:00–14:30, BAR 106

New insights in molecular photoionization physics - Coherence properties of the valence photoionization of N2 and O2 — •Jens Viefhaus1, Markus Ilchen1, Sascha Deinert1, Leif Glaser1, Frank Scholz1, Peter Walter1, Markus Braune2, André Meißner2, Lokesh Tribedi2,3, and Uwe Becker21DESY, Hamburg, Germany — 2Fritz-Haber-Institut, Berlin, Germany — 3Tata Institute of Fundamental Research, Mumbai, India

New Synchrotron Radiation sources such as the "Variable Polarization XUV beamline P04" at PETRA III (DESY, Hamburg) which is presently under construction enable new classes of photoionization experiments. The main characteristics of these beamlines are exceptionally high resolution which well exceeds a resolving power of 10,000 combined with high photon flux "up to 1012 photons per second" and variable polarization properties over a very wide energy range (200-3000 eV in the case of P04 at PETRA III). This allows both to address long standing discussions in photoionization physics such as the two-center interferences in N2 and O2 [1] with high precision over a broad energy range as well as to perform systematic low signal coincidence studies of e.g. the coherence properties of small molecules [2]. Results of exploratory experiments performed at BESSY (HZB, Berlin) and DORIS (DESY, Hamburg) on the valence photoionization of N2 and O2 will be presented and compared with theory [1,3]. In addition an overview on recent experimental developments at different synchrotron radiation centers will be given.

[1] H. D. Cohen and U. Fano, Phys. Rev. 150, 30 (1966).

[2] B. Zimmermann et al., Nature Phys. 4, 649 (2008).

[3] D. Toffoli, P. Decleva, J. Phys. B 39, 2681 (2006).

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