Stuttgart 2012 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 12: Femtosecond Spectroscopy III

MO 12.1: Hauptvortrag

Dienstag, 13. März 2012, 14:00–14:30, V38.03

New insights into solution-phase chemistry under ambient conditions via ultrafast X-ray spectroscopy — •Nils Huse — Ultrafast Molecular Dynamics Group, Max Planck Research Department for Structural Dynamics at the University of Hamburg & Center For Free Electron Laser Science, Hamburg, Germany

The high chemical specificity and localized nature of core-level transitions combined with their sensitivity to valence charge distribution, spin-state, and nuclear motion make transient X-ray spectroscopy a powerful method to study chemical reactions. In particular, solution-phase chemistry has been investigated with time-resolved hard X-ray techniques for the past decade [1-3]; its younger soft X-ray analogue has delivered first results more recently [4-7]. Moreover, the first transient spectroscopy of aqueous solution in the X-ray water window demonstrates the feasibility of studying ultrafast processes via the Nitrogen K-edge. With attosecond sources approaching the necessary photon energies, this type of spectroscopy will allow to follow charge migration and successive chemical reactions in water with the chemical specificity and atomic resolution intrinsic to core-level transitions.

1. Chen et al., Science 292, 262 (2001); 2 Bressler et al., PRL 90, 047403 (2003); 3. Khalil et al., JPCA 110, 38 (2006); 4. Wernet et al., APA 92, 511 (2008), Huse et al., PCCP 11, 3789 (2009); 5. Wen et al., JCP 131, 234505 (2009); 6. Huse et al. JACS 132, 6809 (2010); 7. Huse et al. JPCL 2, 880 (2011).