Hannover 2013 – scientific programme

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MO: Fachverband Molekülphysik

MO 14: Poster 1: Cluster, Femtosecond Spectroscopy

MO 14.14: Poster

Tuesday, March 19, 2013, 16:00–18:30, Empore Lichthof

Fs-pump-prope spectroscopy and strong field ionization of doped He-nanodroplets — •Harald Schmidt¹, Johannes von Vangerow¹, Barbara Grüner¹, Manuel Rometsch¹, Alexandr Bogomolow², Alexey Baklanov², Frank Stienkemeier¹, and Marcel Mudrich¹ — ¹Physikalisches Institut, Universität Freiburg, Hermann-Herderstr. 3, 79108 Freiburg, Germany — ²Institute of Chemical Kinetics and Combustion, Siberian Branch of the Russian Academy of Sciences, Institutskaya 3, Novosibirsk, 630090, Russia

The low temperature and weak interaction with dopants makes He-nanodroplet isolation a widely used technique for high resolution spectroscopy. We combine two-colour fs-pump-probe spectroscopy and velocity-map-imaging - of both ions and electrons - to investigate vibrational wave-packet dynamics and photodissociation of alkali halides. By comparing molecules in the gas phase to those embedded in He-nanodroplets, we study the effect of the surrounding He on the photodynamics.
When illuminated by intense NIR laser pulses, the doped He nanodroplets can turn into a highly reactive nanoplasma environment, in which both the He and the rare gas dopants are multiply ionized to high charge states. Surprisingly, the formation of a nanoplasma is strongly suppressed when doping the droplets with surface-bound alkali and earth-alkali metals. This points at pronounced geometrical effects in the dopant-induced ignition process.