Abstract
Relatively little attention has been paid until now to the problem of impurity-related optical transitions for zerogap semiconductors. The principal reasons were the relatively low values of the resulting absorption coefficients (in comparison with the values corresponding to the usually present interband and intraband transitions) and a very narrow spectral region available for the transmission measurements (limited by the strong absorption mechanisms mentioned above). One of the most interesting impurities in zerogap semiconduction is Fe in HgSe. For the last 5 years a lot of papers have been devoted to the exciting physical properties of this material (see, e.g. [1-4] and the references therein). However, there exist still unresolved problems due to the lack of some experimental data. For the proper description of the iron—lattice interaction the lattice relaxation energy should be determined or at least experimentally estimated. Another problem cOuld be the
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