Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 8: Photoionization II
A 8.2: Hauptvortrag
Montag, 14. März 2011, 17:00–17:30, BAR 106
High-resolution soft X-ray spectroscopies of isolated species — Victor Kimberg, Andreas Lindblad, Xiao-Jing Liu, Christophe Nicolas, Emmanuel Robert, Johan Södreström, Oksana Travnikova, and •Catalin Miron — Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 48, 91192 - Gif-sur-Yvette Cedex, France
Ultra-high resolution X-ray spectroscopies allow probing in great detail femtosecond decay dynamics of inner-shell excited species in both solid state and gas phase. New possibilities have been recently opened owing to bright and highly monochormatic photon beams and state-of-the-art instrumentation available at the newest facilities for dilute matter spectroscopies, such as the PLEIADES beamline in operation since March 2010 at SOLEIL. Doppler types of broadening are nowadays the main limitations of electron spectroscopies at room temperature.
Following the first experimental evidence of Vibrational Scattering Anisotropy (VSA) in the resonant Auger decay of core-excited C2H2 [Miron et al., PRL 2010], we have recently observed VSA in O2, where the interference between direct photoionization and resonant Auger scattering channels represent the only origin of the VSA. We predict VSA to be a completely general phenomenon, which is possible to observe as soon as experimental resolution is high enough. The fully variable polarization and high flux at PLEIADES have been also used to study the Auger electron emission anisotropy from dissociating core-excited SF6 molecules using circularly polarized light, allowing observation of Auger-Doppler profiles [Travnikova et al., PRL 2010].