Abstract
The thermal emission of a metal-backed thin film of LiF is observed at the emission angle of 20 degrees . The observed spectra measured at elevated temperatures are analysed by using the response function based on the virtual-mode theory for the ionic film in order to derive the temperature dependence of the lattice dynamical quantities, such as phonon frequency and damping. The dielectric function derived from a theory based on the thermodynamic Green function technique is considered in the spectrum analysis. The estimated temperature dependence is discussed in terms of the phonon anharmonicity. The LST relation including the phonon anharmonicity is derived from the virtual-mode theory.
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