Luminescence evidence for bulk and surface excitons in free xenon clusters

Cathodoluminescence spectra of free xenon clusters produced by condensation of xenon-argon gas mixtures in supersonic jets expanding into vacuum were studied. By varying initial experimental parameters, including xenon concentration, we could obtain clusters with a xenon core (300-3500 atoms) covere...

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Bibliographic Details
Published in:arXiv.org 2007-10
Main Authors: Danylchenko, O G, Doronin, Yu S, Kovalenko, S I, M Yu Libin, Samovarov, V N, Vakula, V L
Format: Article
Language:English
Subjects:
Argon
Cathodoluminescence
Clusters
Excitons
Gas mixtures
Luminescence
Xenon
Online Access:Get full text
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Summary:Cathodoluminescence spectra of free xenon clusters produced by condensation of xenon-argon gas mixtures in supersonic jets expanding into vacuum were studied. By varying initial experimental parameters, including xenon concentration, we could obtain clusters with a xenon core (300-3500 atoms) covered by an argon outer shell as well as shell-free xenon clusters (about 1500 atoms). The cluster size and temperature (about 40 K for both cases) were measured electronographically. Luminescence bands evidencing the existence of bulk and surface excitons were detected for shell-free xenon clusters. The emission from bulk excitons in small clusters is supposed to be due to processes of their multiple elastic reflections from the xenon-vacuum interface. A presence of an argon shell causes extinction of the excitonic bands. In addition, some new bands were found which have no analogs for bulk xenon cryosamples.
ISSN:2331-8422
DOI:10.48550/arxiv.0710.1218