Relation between dielectric and low-frequency Raman spectra of hydrogen-bond liquids
Relation between dielectric and low-frequency Raman spectra of hydrogen-bond liquids
复制标题
DOI：
10.1103/physrevlett.95.197802
复制
发表时间：
2005-11-04
影响因子：
8.6
通讯作者：
Buchner, R
中科院分区：
文献类型：
--
作者：
Fukasawa, T;Sato, T;Buchner, R
我们分析了氢键液体在微波至太赫兹频率范围内的复介电谱和拉曼谱。对于水和甲醇，介电谱的高频成分，即与主德拜弛豫的微小偏差，明显对应于拉曼光谱。这表明，伴随着巨大的偏振起伏的合作弛豫实际上不是拉曼活性的，而较快的过程反映了共同的微观动力学。对于乙二醇，拉曼光谱的形状也类似于介电光谱的高频偏移，但还检测到了四极构象产生的弱协同弛豫现象。
We analyzed the complex dielectric and Raman spectra of hydrogen-bond liquids in the microwave to terahertz frequency range. As for water and methanol, the high-frequency component of the dielectric spectrum, i.e., the small deviation from the principal Debye relaxation, clearly corresponds to the Raman spectrum. This indicates that the cooperative relaxation, accompanied by huge polarization fluctuation, is virtually not Raman active, whereas the faster processes reflect common microscopic dynamics. For ethylene glycol, the shape of the Raman spectrum also resembles that of the high-frequency deviation of the dielectric spectrum, but, additionally, a weak manifestation of the cooperative relaxation arising from quadrupolar conformers is detected.