Intermediate and Wannier Excitons in Fluid Xenon

Abstract

Reflectivity spectra of Mg${\mathrm{F}}_2$—fluid-xenon interfaces obtained for a wide range of densities revealed that the $n=2\mathrm{}$ Wannier exciton starts to appear at densities above 400 amagat (1 amagat of density for xenon corresponds to 2.7067×${10}^{19}$ atoms/${\mathrm{cm}}^3$). The $n^{\prime }=1\mathrm{}$ exciton appears at densities above about 100 amagats on the low-energy side of the parent $5p^{5}6s$ [$K=\frac{1}{2}$] atomic state. The occurrence and evolution of these bands and of the previously reported $n=1\mathrm{}$ band with density are discussed with use of conductivity relaxation times obtained by Huang and Freeman.