Fig. 9: Excitons and their binding energies in SF6.
From: Near-critical dark opalescence in out-of-equilibrium SF6
a SF6 molecules in a body cubic centered configuration. Golden (silver) spheres represent S (F). a1 and a2 designate two radii for electron-hole pairs. The first length, a1, is fixed, but a2 increases with increasing intermolecular distance. b Upper and lower boundaries for exciton energies according to Eq. (5) for deh = a1 and for deh = a2 and given the variation of intermolecular distance with temperature. c A sketch of the evolution of density inhomegeneity during spinodal decomposition39. The density gradient gently rises and eventually saturates to its full contrast. d The dispersion of an exciton, a cavity photon mode and the resultant hybrid states known as polaritons41,75,76.
