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We have experimentally studied the electronic 3p ← 3s excitation of Na atoms attached to 3 He 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 4 He 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 3 He 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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PACS 68.10.−m, 68.45.−v, 68.45.Gd
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Mayol, R., Ancilotto, F., Barranco, M. et al. Alkali Atoms attached to 3He Nanodroplets. J Low Temp Phys 138, 229–234 (2005). https://doi.org/10.1007/s10909-005-1555-1
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DOI: https://doi.org/10.1007/s10909-005-1555-1