Abstract
We have determined the structure of 4He droplets doped with one or two magnesium atoms. Our results are used to interpret recent resonant two-photon-ionization (R2PI) and laser induced fluorescence (LIF) experiments. We argue that the Mg radial delocalization inside large 4He droplets may reconcile the apparently contradictory solvation properties of magnesium as provided by LIF and R2PI experiments on the one hand, and electron-impact ionization experiments on the other hand. We confirm that several Mg atoms in 4He drops form a soft "foam"-like metastable aggregate rather than coalesce into a compact metallic cluster, in agreement with R2PI experiments.
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