In this work the optical structures due to interband transitions of group-IV transition-metal dichalcogenides have been studied by means of thermoreflectance. The investigated photon energy ranges from 1 to 9 eV, which is a considerable extension with respect to similar previous works. Attention has been focused on the optical properties of the system Ti_1-x{Hf}ₓSe₂, which changes from semimetallic to semiconducting as a function of composition. In particular, the ``anomalous'' evolution of the energy positions of optical structures of the interband spectrum versus lattice and other structural parameters as well as composition has been analyzed. Different behavior of two plasma resonances in the interband spectrum as a function of composition has been seen.
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Borghesi et al. (1986) studied this question.
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