@article {2012|1676,
	title = {Communication: On the origin of the non-Arrhenius behavior in water reorientation dynamics},
	journal = {J. Chem. Phys.},
	volume = {137},
	year = {2012},
	abstract = {<p>We combine molecular dynamics simulations and analytic modeling to determine the origin of the non-Arrhenius temperature dependence of liquid water{\textquoteright}s reorientation and hydrogen-bond dynamics between 235 K and 350 K. We present a quantitative model connecting hydrogen-bond exchange dynamics to local structural fluctuations, measured by the asphericity of Voronoi cells associated with each water molecule. For a fixed local structure the regular Arrhenius behavior is recovered, and the global anomalous temperature dependence is demonstrated to essentially result from a continuous shift in the unimodal structure distribution upon cooling. The non-Arrhenius behavior can thus be explained without invoking an equilibrium between distinct structures. In addition, the large width of the homogeneous structural distribution is shown to cause a growing dynamical heterogeneity and a non-exponential relaxation at low temperature.</p>},
	issn = {00219606},
	author = {Guillaume Stirnemann and Laage, Damien}
}
