Surface location of sodium atoms attached to He-3 nanodroplets
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. The experimental results are supported by Density Functional calculations at zero temperature, which confirm the surface location of sodium on 3He droplets, and provide a microscopic description of the ``dimple'' structure.
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