Hannover 2013 – scientific programme

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MO: Fachverband Molekülphysik

MO 8: Spectroscopy in He-Droplets

MO 8.1: Talk

Monday, March 18, 2013, 16:30–16:45, F 107

Imaging desorption dynamics of alkali doped helium nanodroplets — •Johannes von Vangerow, Amon Sieg, Harald Schmidt, Barbara Grüner, Frank Stienkemeier, and Marcel Mudrich — Physikalisches Institut, Universität Freiburg, Hermann-Herderstr. 3, 79108 Freiburg, Germany

Due to their low temperature (400 mK) and weak interaction, doped helium nanodroplets serve as excellent model systems to study solvation effects and desorption dynamics in the cold temperature regime. Recently, doping by alkali atoms has gained interest because, unlike other dopand species, they dwell in dimple like states at the surface of the droplet. Surprisingly, this many particle system can be desribed as a diatomic molecule. Here we report how far this conclusion applies for heavy alkali atoms and even dimers doping. This work was carried out via state selective multiphoton ionisation and velocity map imaging ion and electron detection. In addition, we recently extended our vmi setup by a femtosecond lasersystem enabeling us to study solvation and desorption dynamics by pump probe imaging spectroscopy.