Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 5: Photoionization I

A 5.2: Hauptvortrag

Montag, 14. März 2011, 14:30–15:00, BAR 106

Appearance of coherent localization due to the Auger Doppler effect — •Burkhard Langer1, Rainer Hentges2, Oliver Kugeler3, Markus Braune2, Sanja Korica2, Jens Viefhaus2, Daniel Rolles2, Uwe Hergenhahn3, Hironobu Fukuzawa4, Xiaojing Liu4, Yusuke Tamenori5, Masamitsu Hoshino6, Hiroshi Tanaka6, Christophe Nicolas7, Catalin Miron7, Omar Al-Dossary8, Kiyoshi Ueda4, and Uwe Becker2,81Freie Universität Berlin — 2Fritz-Haber-Institut, Berlin — 3Institut für Plasma Physik, Garching — 4Tohoku University, Sendai — 5Japan Synchrotron Radiation Research Institute, Hyogo — 6Sophia University, Tokyo — 7Synchrotron SOLEIL, France — 8King Saud University, Riyadh

Homouclear diatomic molecules are inversion symmetric systems which form eigenstates of the parity operator known as gerade and ungerade states. These states are non-local superpositions of charge distributions on both nuclear sites of the molecule with a phase shift of 0 and π, respectively. Due to this intrinsic character a coherent superposition of these states generates a localized state either on the left or on the right side. Such a coherent superposition of two parity eigenstates with different symmetries occurs on top of the broad 3σu shape resonance of O2 because the narrow 3sσg Rydberg excitation is sitting just near its maximum. This gives rise to interference causing coherent localization of the emitter position of the autoionizing electron. As a result of this localization the two Doppler components of the corresponding electron have unequal intensities, the so called wrong component has half of the right component only. This unexpected experimental result could be confirmed by a numerical simulation which takes known values of the decay life time, the splitting of the excited symmetry states and the conical intersection of the corresponding potential curves into account. The result is in perfect agreement with the measurements.

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