Luminescence evidence for bulk and surface excitons in free xenon clusters

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

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2007-10, Vol.76 (4), Article 043202
Main Authors: Danylchenko, O. G., Doronin, Yu. S., Kovalenko, S. I., Libin, M. Yu, Samovarov, V. N., Vakula, V. L.
Format: Article
Language:English
Subjects:
ARGON
ATOMIC AND MOLECULAR PHYSICS
ATOMIC CLUSTERS
ATOMS
CATHODOLUMINESCENCE
EXCITONS
INTERFACES
MIXTURES
REFLECTION
SPECTRA
SUPERSONIC FLOW
SURFACES
TEMPERATURE RANGE 0013-0065 K
XENON
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Summary:The cathodoluminescence spectra of free xenon clusters produced by condensation of xenon-argon gas mixtures in supersonic jets expanding into vacuum were studied. By varying the initial experimental parameters, including the 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 ({approx_equal}1500 atoms). The cluster size and temperature ({approx_equal}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. The presence of an argon shell causes extinction of the excitonic bands. In addition, some bands were found which have no analogs for bulk xenon cryosamples.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.76.043202