INSTABILITY SCENARIOS FOR DOPED HE-4 CLUSTERS

In the frame of finite range density functional (FRDF) theory, we revi ew the systematics of energetic features of He-4(N) clusters doped wit h atomic or molecular impurities, as well as the instability scenario of their collective motions. It is shown that for drops up to N=500, t he predictions of FRDF theory are coincident with those arising from m icroscopic many-body calculations that employ variational or diffusion Monte Carlo methods. For larger drops, the present description predic ts a smooth approach to zero of the collective energies, a scenario th at appears to support the most recent experimental data and microscopi c calculations that demonstrate that the impurity is located within th e bulk of the drop. (C) 1997 American Institute of Physics.