Exciton-impurity luminescence from noncrystalline xenon-argon clusters

TL;DR

This study reports the first observation of exciton-impurity luminescence in xenon-argon clusters, revealing insights into excitonic levels in noncrystalline media through optical emission analysis.

Contribution

It introduces the first detection of exciton-impurity luminescence in binary xenon-argon clusters with multilayer icosahedral structure, expanding understanding of excitonic behavior in noncrystalline systems.

Findings

Observation of exciton-impurity emission band in xenon-argon clusters

Emission occurs near the lowest volume exciton level in xenon

Clusters have multilayer icosahedral structure

Abstract

For the first time in binary mixtures of solid rare gases exciton-impurity luminescence is observed from a xenon-argon system containing argon as impurity. An exciton-impurity emission band is registered for binary clusters with the structure of multilayer icosahedron. The optical transition occurs from an energy level lying very close to the lowest level of volume excitons in bulk xenon samples. The results demonstrate the possibility of probing excitonic levels in noncrystalline condensed media.