Hannover 2010 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 21: Femtosecond Spectroscopy III

MO 21.3: Vortrag

Donnerstag, 11. März 2010, 14:30–14:45, F 102

Femtosecond Spectroscopy of Alkali Trimers on Helium Nanodroplets — •Christian Giese1, Barbara Grüner1, Lutz Fechner1, Marcel Mudrich1, Andreas W. Hauser2, Wolfgang E. Ernst2, and Frank Stienkemeier11Physikalisches Institut, Universität Freiburg, Germany — 2Institut für Experimentalphysik, TU Graz, Graz, Austria

Superfluid helium nanodroplets offer the opportunity to study dopant molecules in the sub-Kelvin range with only weak matrix perturbations. Femtosecond wave packet spectroscopy has been shown to be well suited to obtain high resolution vibrational spectra of cold alkali molecules in weakly bound high-spin states [1]. In a pump-probe scheme a first laser pulse excites a vibrational wave packet that evolves on the molecular potential and is probed by a second ionizing pulse. We present spectroscopic data on Rb3 and K3 showing different vibronic progressions. These are assigned with the help of high level ab-initio calculations of the electronic structure of the bare trimers [2].
[1] M. Mudrich, Ph. Heister, Th. Hippler, Ch. Giese, O. Dulieu, and F. Stienkemeier, Phys. Rev. A 80, 042512 (2009)
J. Nagl, G. Auböck, A. W. Hauser, O. Allard, C. Callegari, and W. E. Ernst, Phys. Rev. Lett. 100, 063001-1-4 (2008)

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