Hydrogen-bond equilibria and life times in a supercooled monohydroxy alcohol

Details Hydrogen-bond equilibria and life times in a supercooled monohydroxy alcohol Hydrogen-bond equilibria and life times in a supercooled monohydroxy alcohol

2011-06-28

arxiv.org/abs/1106.5614v2

Phys. Rev. Lett. 107, 118304 (2011)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.107.118304

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.

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