Creation of Electronic Polaron Complexes in Solid Xenon Observed in Free–Exciton Luminescence under Selective Photon Excitation

Time–resolved excitation spectra of the free exciton luminescence of solid Xenon are measured in the energy range up to 25 eV at 9.5 K. The pronounced structures observed near band gap and two band gap energies are assigned to primary and secondary excitons formed via various mechanisms. For the first time, the creation of free secondary excitons is directly observed in the excitation spectra. The results are assigned to creation of electronic polaron complexes and to inelastic scattering of photocarriers.