Light scattering of supercooled propylene glycol
Light scattering of supercooled propylene glycol
复制标题
过冷丙二醇的光散射
DOI：
10.1088/0953-8984/9/46/005
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
A. Yosihara
中科院分区：
文献类型：
--
作者：
S. Kojima;Hiroki Sato;A. Yosihara
用桑德库克型3+3程串联式法布里-珀罗涉仪和三重栅光谱仪研究了丙二醇的宽带光散射光谱。当温度为363K时，液相的退偏谱明显地呈现出一个峰和一个玻色子峰，且前者的峰在冷却后明显变小。用Davidson-Cole类弛豫、德拜类快速弛豫和玻色子峰的叠加分析了谱线的形状。尽管快弛豫时间与温度无关，但其强度在140K时趋于零。另外，偏振光谱的布里渊分量也观察到了另一个快速弛豫过程。其松弛时间介于-松弛时间和快速松弛时间之间，服从阿累尼乌斯定律。
The broadband light scattering spectra of propylene glycol were studied by using a Sandercook-type 3 + 3-pass tandem Fabry - Perot interferometer and a triple-grating spectrometer. The depolarized spectrum in the liquid phase at 363 K clearly shows an peak and a boson peak, and the former peak becomes lower remarkably on cooling. The line shape of the spectra was analysed by the superposition of relaxation of Davidson - Cole type, a fast relaxation of Debye type and a boson peak. Although the fast relaxation time is temperature independent, its intensity tends to zero at 140 K. Another fast relaxation process was also observed by the Brillouin components of the polarized spectra. Its relaxation time is between the -relaxation time and the fast relaxation time and obeys an Arrhenius law.