Abstract
Abstract The effects of NHY coupling on localized vibration modes around the excitations in MX compounds are investigated. It is shown that the localized modes in an isolated chain will be separated into two chains due to an NHY coupling. Some new modes of lattice vibration are found, which are achieved by the NHY coupling. These results can qualitatively account for the frequency shifts of some modes observed in the Raman and infrared absorption spectra.
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