Darmstadt 2008 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 2: Elektronische Spektroskopie
MO 2.3: Vortrag
Montag, 10. März 2008, 17:00–17:15, 3F
Angle sensitive Doppler-spectroscopy of inversion symmetric molecules — •Rainer Hentges1, Axel Reinköster1, Markus Braune1, Sanja Korica1, Burkhard Langer2, Oliver Kugeler3, Uwe Hergenhahn4, and Uwe Becker1 — 1Fritz-Haber-Institut der MPG, Berlin — 2Freie Universität Berlin — 3BESSY GmbH, Berlin — 4MPI für Plasmaphysik, Garching
One of the most intriguing effects of quantum mechanics is the tunneling and over the barrier reflection effect. Electron tunneling is the basis of the separation of the parity eigenstates in all homonuclear diatomic or, more general, inversion symmetric molecules. However, electron tunneling on real time scale became only very recently subject of experimental investigations. These investigations were still limited to tunneling barriers induced by the probe pulse. Natural barriers, such as the barriers between the two identical atoms in homonuclear molecules, have so far never been studied. We present the first results of indirect time resolved studies on the electron tunneling effect in O2 and SF6. Excitation of these molecules into dissociative excited states gives rise to autoionization of the dissociating system [1]. The fingerprint of this process is the Doppler-shift of the autoionizing electrons in the molecular frame. We show that the Doppler-shifted autoionizing lines provide a tool to study the fraction of core-holes which have been tunneled to the other atomic site of the homonuclear molecule during the deexcitation process. This is an indirect measurement of electron tunneling in homonuclear molecules.
[1] Björneholm et al., Phys. Rev. Lett. 84, 2826 (2000)