Abstract
Raman scattering techniques have been used to investigate the long- wavelength optical phonon spectrum of the pyrite-type transition metal diselenides CoSe 2 and CuSe 2. Of the five Raman-active phonon peaks expected by group theory only one has been observed in CoSe 2 and three in CuSe 2 at 300 and 77°K. Overtone scattering is also observed in CuSe 2. As these materials are highly conducting it is concluded that appreciable damping by free carriers obscures the observation of the missing modes.
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