Formation times of RbHe exciplexes on the surface of superfluid versus normal fluid helium nanodroplets |
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Authors: | Droppelmann G Bünermann O Schulz C P Stienkemeier F |
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Affiliation: | Universit?t Bielefeld, Universit?tsstrasse 25, D-33615 Bielefeld, Germany. |
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Abstract: | Nanodroplets of either superfluid 4He or normal fluid 3He are doped with Rb atoms that are bound to the surface of the droplets. The formation of RbHe exciplexes upon 5P(3/2) excitation is monitored in real time by femtosecond pump-probe techniques. We find formation times of 8.5 and 11.6 ps for Rb 4He and Rb 3He, respectively. A comparison to calculations based on a tunneling model introduced for these systems by Reho et al. [J. Chem. Phys. 113, 9694 (2000)]] shows that the proposed mechanism cannot account for our findings. Apparently, a different relaxation dynamics of the superfluid opposed to the normal fluid surface is responsible for the observed formation times. |
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