Alkali Atoms Attached to 3He Nanodroplets
R. Mayol, F. Ancilotto, M. Barranco, O. Bünermann, M. Pi, F. Stienkemeier
Abstract
We have experimentally studied the electronic 3p-> 3s excitation of Na atoms attached to 3He droplets by means of laser-induced fluorescence as well as beam depletion spectroscopy. From the similarities of the spectra (width/shift of absorption lines) with these of Na on 4He droplets, we conclude that sodium atoms reside in a ``dimple'' on the droplet surface and that superfluid-related effects are negligible. The experimental results are supported by Density Functional calculations at zero temperature, which confirm the surface location of Na, K and Rb atoms on 3He droplets. In the case of Na, the calculated shift of the excitation spectra for the two isotopes is in good agreement with the experimental data.
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