Instability scenarios for doped He4 clusters

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Abstract
In the frame of finite range density functional (FRDF) theory, we review the systematics of energetic features of 4 He N clustersdoped with atomic or molecular impurities, as well as the instability scenario of their collective motions. It is shown that for drops up to N=500, the predictions of FRDF theory are coincident with those arising from microscopic many-body calculations that employ variational or diffusionMonte Carlo methods. For larger drops, the present description predicts a smooth approach to zero of the collective energies, a scenario that appears to support the most recent experimental data and microscopic calculations that demonstrate that the impurity is located within the bulk of the drop.