Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

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

MO 13.19: Poster

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

Imaging photoionization dynamics of doped Helium Nanodroplets and molecular Rydberg states — •Johannes von Vangerow1, Alexandr Bogomolov2, Barbara Grüner1, Alexey Baklanov2, Frank Stienkemeier1, and Marcel Mudrich11Physikalisches Institut, Universität Freiburg, Hermann-Herderstr. 3, 79108 Freiburg, Germany — 2Institute of Chemical Kinetics and Combustion, Institutskaya Str. 3, Novosibirsk 630090, Russia

With temperatures in the cold regime (0.38 K) and only weak interaction, doped Helium Nanodroplets are interesting environments to study pertubations of atoms and molecules induced by many particle interaction. Within this context, we will present results concerning the desorption dynamics of the heavy alkali atoms Rb and Cs from helium droplets. Both dopants are weakly attached to the droplet surface. By resonance enhanced multiphoton-ionization via low lying pseudodiatomic Σ- and Π-states and subsequent ion and electron imaging, we observe dissociation dynamics similar to that of a diatomic molecule and an energy transfer to the droplet during the desorption process, suggesting substantial He-droplet excitation.
The second part of the poster focuses on high-lying gerade Rydberg states of molecular iodide within the [2Π1/2]c8s;0g and [2Π1/2]c8s;1g band. In a collaborative1,2 velocity map imaging study, five different dissociation channels have been observed. One channel indicates predissociation via an ion pair state, the others correspond to predissociation via lower lying covalent Rydberg states.

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