Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

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

MO 13.23: Poster

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

Allyl Radicals in Helium Nanodroplets — •Daniel Leicht, Daniel Habig, Gerhard Schwaab, and Martina Havenith — Physical Chemistry 2, Ruhr-University Bochum, Germany

The allyl radical is the simplest π-conjugated hydrocarbon radical having an open-shell electronic structure due to its unpaired electron [1]. It has been firmly established that the allyl radical exhibits C_2v symmetry with a 2A₂ ground electronic state [2]. Like all other C₃-hydrocarbon units allyl radicals are believed to be precursors in the formation of soot and polynuclear aromatic hydrocarbons [3]. Furthermore, the allyl radical is a key intermediate in tropospheric chemistry.

Superfluid helium nanodroplets have been demonstrated to be an effective tool for studying transient species such as radicals. Because of their high reactivity the knowledge of these systems and their interactions is still in its infancy. However, spectroscopy in helium nanodroplets makes it possible to investigate not only the bare allyl radical, but also its reactions and interactions with other molecules (e.g. O₂ or HCl) at 0.37 K.

[1] K. Tonokura and M. Koshi, J. Phys. Chem. A 2000, 104, 8456-8461

[2] J.Han et. al., J. Chem. Phys., Vol. 116, No. 15, 15 April 2002

[3] T. Schultz and I. Fischer, J. Chem. Phys., Vol. 109, No. 14, 8 October 1998