Abstract High-temperature Raman spectroscopic study of order-disorder transition in Pentaerythritol [C(CH2OH)4] is reported. The changes in the Raman spectra with increasing temperature have been followed up to ≈503 K. We observe several changes in the spectra including merging of modes, appearance of new modes and sudden change in the slope of the frequency vs temperature curve at ≈ 452 K. In addition, sudden enormous broadening of almost all the modes are noted at ≈ 452 K indicating order-disorder transition of first order in nature. The transition has been found to be completely reversible.

中文翻译：

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使用拉曼散射在季戊四醇中的有序-无序转变

摘要 报道了季戊四醇 [C(CH2OH)4] 中有序-无序转变的高温拉曼光谱研究。随着温度升高，拉曼光谱的变化已经追踪到 ≈503 K。我们观察到光谱的几种变化，包括模式的合并、新模式的出现以及频率与温度曲线斜率在 ≈ 452 K 处的突然变化此外，在≈ 452 K 处注意到几乎所有模式的突然巨大展宽，表明自然界中一阶的有序-无序转变。已经发现这种转变是完全可逆的。