Abstract
AbstractPolarized IR‐reflection and Raman scattering spectra are obtained for TlGaTe2, TlInTe2, and TlInSe2 crystals (space group D). The IR‐reflection spectra of all the crystals show the presence of two (E ‖ c) and three (E ⟂ c) modes, which is in full agreement with the prediction of a group‐theoretical analysis. All seven Raman active modes are detected in TlInSe2. In TlGaTe2 and in TlInTe2 only three of seven Raman active modes can be observed. Normal coordinates, effective force constants, and effective charges are determined for the infra‐red active lattice vibrations.
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