Low Temperature Physics: 29, 822 (2003); https://doi.org/10.1063/1.1619352 (10 pages)
Физика Низких Температур: Том 29, Выпуск 9-10 (Сентябрь 2003), c. 1081-1092    ( к оглавлению , назад )

Prompt and delayed secondary excitons in rare gas solids

M. Kirm1, V. Kisand2, E. Sombrowski3, B. Steeg3, S. Vielhauer1, and G. Zimmerer1

1 Institut für Experimentalphysik, University of Hamburg, 149 Luruper Chaussee, Hamburg D–22761, Germany
E-mail: Georg.Zimmerer@desy.de

2 Institute of Physics, University of Tartu, 142 Riia, Tartu 51014, Estonia

3 Deutsches Elektronensynchrotron DESY, 85 Notkestrasse, Hamburg 22607, Germany

Аннотация

Direct and indirect creation of excitons in rare gas solids has been investigated with reflectivity and luminescence spectroscopy. For the heavy rare gas solids Kr and Xe, new and more reliable exciton parameters have been deduced. With time-resolved luminescence spectroscopy, fast and delayed secondary-exciton creation has been established and separated. Thermalization of photocarriers and their delayed recombination have been analyzed, including a first attempt to investigate the influence of excitation density on the carrier dynamics. The existence of excitonic side bands of ionization limits Ei (either band gap or inner-shell ionization limits) in prompt secondary exciton creation has been established. The threshold energies of these side bands are given by EthEi nEex (n is integer, Eex is exciton energy). The side bands are ascribed to the formation of electronic polaron complexes, superimposed to inelastic scattering of photoelectrons.

PACS:
71.35.Cc - Intrinsic properties of excitons; optical absorption spectra
72.20.Jv - Charge carriers: generation, recombination, lifetime, and trapping
78.47.+p - Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter (see also 42.65.Re-in nonlinear optics; 82.53.-k Femtochemistry in physical chemistry and chemical physics)
78.55.Hx - Other solid inorganic materials