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Secondary emission of excitons in CuCl polycrystals
Author(s) -
Mashchenko V. E.,
Kharsik V. F.,
Brezhneva S. V.
Publication year - 1986
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221350120
Subject(s) - exciton , annihilation , atomic physics , emission spectrum , spectral line , phonon , excitation , radiative transfer , coupling constant , chemistry , physics , materials science , condensed matter physics , optics , nuclear physics , quantum mechanics , astronomy , particle physics
Secondary emission (SE) spectra of CuCl platelets and quenched bulk polycrystals, grown from a solution at 4.5 to 200 K, are studied. The low‐temperature SE spectra are caused by the radiative decay of free and bound excitons of the Γ 6 —Γ 8 series. The SE at T ∼ 77 K is due to the annihilation of free excitons of the Z 3 (Γ 6 —Γ 8 ) series. The growth of excitation gives rise to considerable increasing the phonon replica intensity (Z 3 −2LO), which is dominating in a spectrum within the range of excitation rates from 10 27 to 10 30 cm −3 s −1 , when the emission appears to be stimulated one. The translational mass of excitons and the reduced mass of a hole (3.4 m 0 and 2.9 to 3.0 m 0 , respectively) are calculated from the line approximation by a Maxwellian contour. The increase of the exciton—phonon coupling constant when introducing imperfections is found experimentally, and the new data obtained are discussed.