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Impact Excitation and Auger Decay of Bound Exciton Complexes in a Dense Exciton Gas
Author(s) -
Kharchenko V. A.,
Mikhailov G. V.,
Nelson D. K.,
Razbirin B. S.
Publication year - 1990
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.2221590149
Subject(s) - exciton , excitation , atomic physics , excited state , auger , line (geometry) , spectral line , luminescence , quenching (fluorescence) , biexciton , emission spectrum , auger effect , chemistry , range (aeronautics) , physics , materials science , fluorescence , condensed matter physics , optics , geometry , mathematics , quantum mechanics , astronomy , composite material
Impact excitation processes due to free exciton collisions with bound exciton complexes D°X are studied in CdS. It is found that the excitation power increasing from 10 3 to 10 4 W/cm 2 leads to a considerable decrease of the I 2 line intensity followed by the disappearence of the I 2 line at the upper limit, whereas the I 1 line can be distinctly seen in the luminescence spectra in the whole range of the excitation power. A model explaining the quenching of the I 2 emission line by the Auger‐decay of an excited state of the D°X complex at high concentrations of free excitons is proposed. Experimental data are in good agreement with predicted dependences.