The position of the main spectral features (located at ∼445, ∼575, ∼625, ∼925 and ∼1145 cm⁻¹) in the Raman spectrum of UO₂ has been examined from room temperature up to 600 °C. The wavenumber shifts measured for the observed bands have allowed us to obtain the temperature dependence (dω/dT) of the different vibrational modes. Our measurements corroborate the assignment of the band observed at ∼1145 cm⁻¹ to the 2LO overtone. In addition, the temperature dependence of the bandwidths of the T_2g and 2LO modes has been analysed.

中文翻译：

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UO ₂拉曼光谱的温度依赖性

从室温到最高600°C，已经检查了UO ₂拉曼光谱中主要光谱特征（分别位于445、575、625、925和1145 cm ^-1）的位置。为观察到的频带测得的波数移位已使我们能够获得不同振动模式的温度依赖性（dω / dT）。我们的测量结果证实了在1145 cm ^-1处观察到的频带与2LO泛音的分配。另外，已经分析了T _2g和2LO模式的带宽的温度依赖性。