Dielectric screening--, multiple scattering--, and quantum indistinguishability effects in the IR emission spectrum of Xe$_2$ excimers in dense Xe gas

Abstract

We report new measurements of the infrared emission spectrum of Xe2 excimers produced by electron impact in dense gas at room temperature. These measurements extend the density range previously explored by a factor of two. We have now reached a pressure P ≈ 3.3 MPa, corresponding to a gas density N ≈ 8 • 10 26 m −3 in both pure Xe gas and in a Ar-Xe mixture. The analysis of the changes of the spectrum induced by the interaction with the gaseous environment shows how cooperative-and many-body effects develop with increasing density. We also show that quantum effects related to the indistinguishability of identical particles are observed even at such high temperature.