Abstract
The lattice vibration spectra of TlS and TllnSe 2 crystals were investigated by infrared reflectivity in the wavenumber range from 20 to 5000 cm −1. The frequencies of K = 0 phonons were determined by Kramers-Kronig analysis of the spectra. All five infrared active lattice vibrations predicted by the group theoretical analysis were identified. The normal coordinates of vibrations for five infrared active phonons were determined. In the approximation which does not take into consideration long range Coulomb interaction values of the force constant and effective changes are obtained for TlSe, TlS and TllnSe 2 crystals.
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