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An electron diffraction diagnostics of substrate-free clusters formed inN2-Kr binary jets expanding through a supersonic nozzle into vacuum was carriedout. Gas mixtures contained 0.5, 1, and 6 mol.% krypton, the measured averagesizes of aggregations in the cluster beam varied from 500 to 30,000 moleculesper cluster. A change in the nucleation mechanism in the jet from heterogeneousto homogeneous was revealed when the temperature of the gas mixture at thenozzle inlet T0 increased from 100 K to 120 K, which had a profound effect onthe sizes, phase composition and component composition of the clusters. It wasestablished that the intensification of cluster growth by inserted kryptonnucleation centers at T0 = 100 K occurs through an increase in the fraction ofthe fcc phase. At T0 = 120 K, the effect of cluster growth suppression by theaddition of an impurity with significantly stronger intermolecular forces wasrevealed for the first time. It is shown that the effect is manifested when thekrypton gas content increases to 6 mol.% and is caused by the kinetics of gascondensation in a supersonic jet.

Electron diffraction study of the formation and growth of clusters in supersonic binary N2-Kr gas jets