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Surface location of sodium atoms attached to 3He nanodroplets
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We have experimentally studied the electronic $3p\leftarrow 3s$ 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 sodium on $^3$He droplets, and provide a detailed description of the ``dimple'' structure. The calculated shift of the excitation spectra for the two isotopes is in good agreement with the experimental data.
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STIENKEMEIER, F., et al. Surface location of sodium atoms attached to 3He nanodroplets. Physical Review B. 2004. Vol. 70, num. 21, pags. 214509-1-214509-5. ISSN 0163-1829. [consulted: 11 of October of 2026]. Available at: https://hdl.handle.net/2445/10547