Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 13: Posters 3: Cold Molecules, Helium Nano Droplets, and Experimental Techniques

MO 13.39: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Molecular Frame Photoelectron Angular Distributions in Dissociating CF3I Molecules — •Felix Brauße, Arnaud Rouzée, and Marc Vrakking — Max-Born-Institut für nichtlineare Optik, Berlin

Over the last decade, the emergence of x-ray free-electron lasers (FELs) and high-order harmonic generation (HHG) XUV-sources has enabled the development of diffractive methods for elucidating time-resolved molecular dynamics. Indeed, one of the main driving forces behind the development of the FEL is the possibility to perform x-ray diffractive imaging in molecules; alternatively, diffractive information can as well be encoded onto photoelectrons that are generated by the ionisation of the molecules with an ultrashort XUV or x-ray pulse. The theory of photoelectron–molecule scattering has been studied thoroughly and a number of successful experiments relying on this concept have already been performed at synchrotrons with ground state molecules.

Here, we theoretically investigate the possibility to probe the dissociation dynamics of CF3I molecules induced by excitation at 266 nm, using the photoelectrons generated by a time-delayed soft x-ray pulse. As a first step, the photoelectron angular distributions of a fixed in space CF3I molecule in its ground state are calculated with the aid of the Schwinger variational principle and are compared to the predictions from an intuitive forward scattering model.

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