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MO: Fachverband Molekülphysik

MO 23: Molekülphysik Poster 2

MO 23.2: Poster

Thursday, March 5, 2009, 16:30–19:00, VMP 8 Foyer

Vibrational wave packet dynamics of Rb₂ formed on helium nanodroplets — •Philipp Heister, Thomas Hippler, Marcel Mudrich, and Frank Stienkemeier — Physikalisches Institut, Universität Freiburg

Superfluid helium nanodroplets are a valuable tool to investigate alkali dimers at temperatures in the millikelvin range. Using fs-pump-probe spectroscopy we study the dynamics of wave packets created by the coherent superposition of vibrational states of triplet Rb₂ molecules. Upon excitation, desorption of Rb₂ off the helium droplet leads to an undamped wave packet motion, which is mass selectively detected in the photo ionization signal. We are able to observe wave packet dynamics up to 2 ns. This allows us to study the de- and rephasing mechanism of wavepackets of Rb₂ initially coupled to the helium droplet environment. Fourier analysis provides high resolution vibrational spectra of triplet ground and first excited states, which are compared to ab initio calculations.