Hannover 2016 – scientific programme

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MO: Fachverband Molekülphysik

MO 20: Femtosecond Spectroscopy 4

MO 20.2: Talk

Friday, March 4, 2016, 11:15–11:30, f102

XUV Transient Absorption Spectroscopy of Photochemical Reactions — •Lorenz Drescher, Martin Galbraith, Geert Reitsma, Judith Dura, Oleg Kornilov, Serguei Patchkovskii, Marc Vrakking, and Jochen Mikosch — Max-Born-Institut, Berlin, Germany

Transitions of atomic core orbitals into unoccupied molecular valence orbitals offer a site-specific view of chemical binding [1]. Spectrally, such resonant transitions are located just below the inner-shell ionization edges. Recent advances in generation of XUV pulses from High Harmonic Generation (HHG) allow to probe such molecular core-to-valence transitions in transient absorption spectroscopy at ultrafast time resolution in a tabletop setup [2]. In our experiment, methyl iodide and iodobenzene photodissociations have been excited by 266 nm femtosecond laser pulses and the transient absorption spectra at the 4d-pre-edge of iodide have been measured using quasi-continuuos XUV spectra from HHG driven by sub-6 fs NIR pulses. Our results show the rearrangement of the valence shell after excitation and how the electronic states involved in photodissociation differ for iodobenzene and methyl iodide molecules.

[1] J. Stöhr, NEXAFS Spectroscopy, Springer (1992)

[2] Attar et al., JCP 141, 164308 (2014)