We have experimentally studied the electronic 3p<--3s excitation of Na atoms attached to He-3 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 He-4 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 He-3 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.
Surface location of sodium atoms attached to He-3 nanodroplets
ANCILOTTO, FRANCESCO;
2004
Abstract
We have experimentally studied the electronic 3p<--3s excitation of Na atoms attached to He-3 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 He-4 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 He-3 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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