Influence of helium on the fine structure performances of niobium condensate formed from low-energy atom-ion fluxes

Influence of helium atoms on the structure performances of niobium condensates precipitated from own atom-ion fluxes was investigated. It was shown that introduction of He atoms leads to a decrease of average block size. At the same time it does not influence on the physical processes of coating fine structure formation. With the help of thermodesorption spectroscopy method it was found that helium atoms are included, mainly, in vacancy-impurity complexes. A conclusion is made that near-surface vacancies play a leading role in formation of a block structure of condensates precipitated from ion-plasma fluxes. (author). 25 refs., 4 figs