Abstract
We discuss the properties of barium clusters (neutral or charged) implanted into liquid helium and propose a model where individual barium atoms cannot form negative ions, whereas a barium cluster composed of many barium atoms can. This property is important from the standpoint of applications involving laser ablation of barium metal surfaces in liquid helium. We note the qualitative differences in the mechanisms of formation of quasi-one-dimensional chains of metal or dielectric dust during its implantation into superfluid helium. A likely scenario for a dispersed metal is the dendritic breakdown in a parallel plate capacitor filled with metal dust and a finite potential difference between the plates. It is not possible to use the dendritic mechanism of cluster evolution for the dielectric problem and the details of this mechanism do not agree well with existing observations. We outline a scenario alternative to the vortex formation of long chains with dielectric links.
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