Abstract
NMR is used to study the mechanisms for the reorientation of protein hydration water. In the past, crossovers in temperature-dependent correlation times were reported at () and (). We show that neither nor are related to a fragile-to-strong transition. Our results rule out an existence of . Also, they indicate that water performs thermally activated and distorted tetrahedral jumps at , implying that originates in an onset of this motion, which may be related to a universal defect diffusion in materials with defined hydrogen-bond networks.
- Received 10 June 2008
DOI:https://doi.org/10.1103/PhysRevLett.101.225701
©2008 American Physical Society