Hydrogen-Bond Equilibria and Lifetimes in a Monohydroxy Alcohol

被引：86

作者：

Gainaru, C. ^{[1
]}

Kastner, S. ^{[2
]}

Mayr, F. ^{[2
]}

Lunkenheimer, P. ^{[2
]}

Schildmann, S. ^{[1
]}

Weber, H. J. ^{[1
]}

Hiller, W. ^{[3
]}

Loidl, A. ^{[2
]}

Boehmer, R. ^{[1
]}

机构：

[1] Tech Univ Dortmund, Fak Phys, D-44221 Dortmund, Germany

[2] Univ Augsburg, Inst Phys, D-86135 Augsburg, Germany

[3] Tech Univ Dortmund, Fak Chem, D-44221 Dortmund, Germany

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 11期

关键词：

GLASS-FORMING LIQUIDS; DIELECTRIC-RELAXATION; DYNAMICS; WATER; MODEL; FLUCTUATIONS; ABSORPTION; DISPERSION; METHANOL; SPECTRA;

D O I：

10.1103/PhysRevLett.107.118304

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Dielectric loss spectra covering 13 decades in frequency were collected for 2-ethyl-1-hexanol, a monohydroxy alcohol that exhibits a prominent Debye-like relaxation, typical for several classes of hydrogen-bonded liquids. The thermal variation of the dielectric absorption amplitude agrees well with that of the hydrogen-bond equilibrium population, experimentally mapped out using near infrared (NIR) and nuclear magnetic resonance (NMR) measurements. Despite this agreement, temperature-jump NIR spectroscopy reveals that the hydrogen-bond switching rate does not define the frequency position of the prominent absorption peak. This contrasts with widespread notions and models based thereon, but is consistent with a recent approach.

引用

页数：5

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