Hannover 2010 – scientific programme

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MO: Fachverband Molekülphysik

MO 7: Poster: Femtosecond Spectroscopy

MO 7.1: Poster

Tuesday, March 9, 2010, 16:00–18:30, Lichthof

Vibrational wave packet dynamics of alkali molecules formed on helium nanodroplets — •Barbara Grüner¹, Christian Giese¹, Lutz Fechner¹, Matthew Sievert¹, Martin Schlesinger², Marcel Mudrich¹, and Frank Stienkemeier¹ — ¹Physikalisches Institut, Universität Freiburg, Germany — ²Institut für Theoretische Physik, Technische Universität Dresden, Germany

Isolation in superfluid helium nanodroplets is a valuable tool for investigating molecules at temperatures in the millikelvin range as well as for studying decoherence mechanisms in weakly coupled molecule-bath systems. Using fs-pump-probe spectroscopy we study the dynamics of wave packets formed by the coherent superposition of vibrational states of both rubidium and potassium dimers and trimers. Wave packet dynamics is mass selectively detected after desorption off the helium nanodroplets and can be observed up to nanoseconds. Fourier analysis of the data reveals the vibrational modes of the high-spin alkali molecules (triplet states for dimers and quartet states for trimers), which are compared to ab initio calculations