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Antiresonances in the Fundamental Spectra of CdI 2 –4H and CdBr 2 –6R Crystals
Author(s) -
Dovgyi Ya. O.,
Kityk I. V.
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.2221570148
Subject(s) - exciton , antiresonance , spectral line , chemistry , molecular physics , absorption spectroscopy , atomic physics , ionization , condensed matter physics , resonance (particle physics) , physics , ion , optics , astronomy , organic chemistry
Abstract On the basis of the low temperature spectra measured for CdI 2 (4H‐polytype) and CdBr 2 (6R‐polytype) crystals in the region of UV radiation in the exciton resonance vicinity the distinct antiresonance are discovered. The exciton interaction with the continuous spectrum corresponding to interband transitions is determined to cause a self‐ionization and a band widening. That is the Fano effect manifestation. The exciton dynamical instability in the cadmium dihalide crystals is shown to be caused by energy band structure pecularities. According to the analysis of the absorption curve profiles and antiresonances parameters and types at T = 77 K the matrix element values of the exciton state hybridization with the continuous spectrum states are obtained. A significant dispersion of the antiresonance parameter being caused by the complex structure of the valence bands in cadmium dihalide is discovered.