Abstract
The energies of IR active A2u modes in both HfSe2 and HfS2 are not known, since it is experimentally difficult to perform IR spectroscopy measurements for E || c. The experimental results of our first and second order resonance Raman measurements show that A2u(TO) = 180cm−1 and A2u(LO) = 295cm−1 in HfS2; in HfSe2 we obtain A2u(TO) = 120cm−1 and A2u(LO) = 175cm−1. Our results are consistent with those theoretically calculated by means of the polarizable ion model.
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