Relation between dielectric and low-frequency Raman spectra of hydrogen-bond liquids

被引:294
作者
Fukasawa, T
Sato, T
Watanabe, J
Hama, Y
Kunz, W
Buchner, R
机构
[1] Waseda Univ, Fac Sci & Engn, Div Pure & Appl Phys, Shinjuku Ku, Tokyo 1698555, Japan
[2] Waseda Univ, Adv Res Inst Sci & Engn, Tokyo 1698555, Japan
[3] Osaka Univ, Grad Sch Frontier Biosci, Suita, Osaka 5650871, Japan
[4] Univ Regensburg, Inst Phys & Theoret Chem, D-93040 Regensburg, Germany
关键词
D O I
10.1103/PhysRevLett.95.197802
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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.
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页数:4
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