Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

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

MO 13.22: Poster

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

Mass-resolved pump-probe spectroscopy of alkali-doped He nanodroplets — •Oliver John¹, Johannes von Vangerow¹, Harald Schmidt¹, Daniel Reich², Wojciech Skomorowski², Christiane Koch², Frank Stienkemeier¹, and Marcel Mudrich¹ — ¹Physikalisches Institut, Universität Freiburg, Hermann-Herderstr. 3, 79108 Freiburg, Germany — ²Physikalisches Institut, Universität Kassel, Heinrich-Plettstr. 40, 34132 Kassel, Germany

Cold helium nanodroplets (400mK) possess several remarkable properties such as suprafluidity, making them attractive matrices for spectroscopy of a wide range of embedded atoms and molecules.

The first topic of this poster concerns Rb-doped He nanodroplets. The aim of this ongoing investigation is to understand the desorption dynamics of Rb dopants upon excitation and ionization by mass-resolved femtosecond pump probe spectroscopy via the pseudodiatomic 6pΣ and 6pΠ states. Recent results show a pronounced drop of the ion yield for pump probe delays below one picosecond, suggesting either submersion of Rb ions or a reduced ionization cross section in the vicinity of He droplets.

The second topic focuses on vibrational wave packet dynamics within the A-state of lithiumiodide in the gas phase. From the pump-probe transients we derive properties of the potentials including coupling parameters at avoided curve-crossings by comparing to quantum dynamics simulations. In LiI doped He droplets we observe very fast relaxation dynamics, indicating strong interaction with the He.