Novel well-resolved emission lines in the spectral range of phonon replicas were observed in lowtemperature magnetoluminescence spectra of the two-dimensional electron gas in In Gal "As/GaAs quantum wells. These lines were assigned to Landau-level transitions with an emission of coupled magnetoplasmon -LO-phonon modes. The couplings were found to increase strongly near the resonances between the energies of the LO phonon and multiples of the cyclotron energies.
The effect of adsorption‐desorption processes on recombination and capture of charge carriers on real germanium surfaces is investigated. It is shown that the quasicontinuous energy spectrum of recombination levels is independent of the spectrum of fast states. Changes in the parameters of the spectrum of recombination centres in adsorption are associated with the rearrangement of the disordered surface phase as a result of creation of new surface chemical complexes. A possible model of surface recombination centres is discussed.
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