Abstract
AbstractThe anharmonicity of the infrared active lattice modes of sodium nitrate is studied by measurements of the temperature dependence of the reflectivity. The infrared reflectivity is recorded from 10 to 600 cm−1, in the temperature range 23 to 300 °C, and analysed with the four‐parameter semi‐quantum model. The comparison between the results of the quantum theory and the observed dependence of damping shows that cubic anharmonicity drives the lattice dynamics of sodium nitrate in the low‐temperature phase. Damping divergence is observed for several modes in the vicinity of the phase transition temperature.
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