Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

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

MO 13.21: Poster

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

LIF spectroscopy of laser-ablated atoms in He nanodroplets and dense He gas — •Sharareh Izadnia, Aaron Laforge, and Frank Stienkemeier — Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str.3, 79104 Freiburg, Germany

Van der Waals forces make extremely weak intermolecular bonds and play a crucial role in physical, chemical, and biological systems. Until recently, helium dimers, with an average interatomic nuclear distance of 52 Å, were the weakest bound experimentally observed system [1]. Now, however, an even weaker system, LiHe dimers, has been found by Tariq et al.[2]. Using laser ablation of lithium in a cryogenically-cooled helium buffer gas, LiHe dimers were formed via a three body recombination process and experimentally observed by laser induced fluorescence (LIF)[2].In our lab, we have recently developed a method to dope helium nanodroplets using a similar laser ablation setup. Surprisingly, it was found that not only were the ablated materials doped to nanodroplets, but they were also seeded in a cold He gas jet. In light of this and the previous work, we plan to perform LIF spectroscopy on laser ablated alkali atoms doped to nanodroplets and seeded in a dense gas. Our experimental approach along with the first results will be shown.

[1] R. E. Grisenti, W. Schölkopf, J. P. Toennies, G. C. Hegerfeldt, T. Köhler, and M. Stoll, Phys. Rev. Lett. 85, 2284 (2000)

[2] N. Tariq, N.Al Taisan, V. Singh, and J. D. Weinstein, Phys. Rev. Lett. 110, 153201 (2013)