Diagnostics of composition and size of clusters formed in supersonic jets of Ar–Kr gas mixtures

The electron diffraction technique is employed to study the component composition of binary Ar–Kr clusters with N¯=1×103−9×104 atoms/cluster as a function of cluster size and the composition of the feed gas mixture. A diagram showing the conditions under which homogeneous Kr clusters rather than het...

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Bibliographic Details
Published in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2015-08, Vol.41 (8), p.637-644
Main Authors: Danylchenko, O. G., Kovalenko, S. I., Konotop, O. P., Samovarov, V. N.
Format: Article
Language:English
Subjects:
Clusters
Composition
Electron diffraction
Gas mixtures
Gases
Krypton
Molecular gases
Parameters
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Summary:The electron diffraction technique is employed to study the component composition of binary Ar–Kr clusters with N¯=1×103−9×104 atoms/cluster as a function of cluster size and the composition of the feed gas mixture. A diagram showing the conditions under which homogeneous Kr clusters rather than heterogeneous Ar–Kr clusters are generated in the jet is presented for the first time. It is found that the key parameters to analyze the composition of clusters are the critical cluster radius Rcr and the critical Kr gas concentration Ccr. For the parameter range of heterogeneous cluster formation (CKrgas < Ccr and R > Rcr), an analytical expression is provided which describes quantitatively the enrichment of such clusters with krypton. The results obtained allow one to predict the composition of clusters produced in experiments with binary jets of noble and simple molecular gases, as well as to control simultaneously their size and composition.
ISSN:1063-777X
1090-6517
DOI:10.1063/1.4928921