Influence of temperature on IR spectra of fluoride complexes of group IV and V elements

Abstract

An increase in temperature, within the limits of stability of a given structural modification of the crystal, in the general case may lead to a smooth change in all three parameters of the bands in the vibrational spectrum: frequency, half-width, and intensity. Whereas the temperature dependence of the frequency is usually related to changes in the lengths and corresponding force constants of the bonds [2], and the temperature dependence of the half-width to changes in the parameters of Brownian rotational motion of the particles [3], the temperature dependence of the IR spectral band intensity is not subject to any such unambiguous interpretation.