Luminescence evidence for bulk and surface excitons in free xenon clusters

Details Luminescence evidence for bulk and surface excitons in free xenon clusters Luminescence evidence for bulk and surface excitons in free xenon clusters

2007-10-05

arxiv.org/abs/0710.1218v1

Phys. Rev. A76, #4, 043202 (2007)

Physics

Atomic and Molecular Clusters

The final modified version will be published in Phys. Rev. A 76 (2007)

Scientific paper

10.1103/PhysRevA.76.043202

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.

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