Abstract
Thermal emission spectra of CaF2 thin films evaporated on Pt plates are measured at elevated temperatures. P-polarized spectra observed at the emission angle of 25° show sharp peaks around phonon frequencies. Considerable changes in the spectra are found for films prepared under different conditions. The spectra of a film heat-treated at 680°C are analysed using the response function based on the virtual-mode theory for ionic slabs, in order to estimate the temperature dependence of the lattice dynamical quantities such as phonon frequency and damping. The temperature dependence is discussed in terms of a theory of phonon anharmonicity.
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