Hydrogen-bond equilibria and life times in a supercooled monohydroxy   alcohol
  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. 
C. Gainaru, S. Kastner, F. Mayr, P. Lunkenheimer, S. Schildmann, H. J.   Weber, W. Hiller, A. Loidl, and R. B\"ohmer
cond-mat.soft