Nuclear-quadrupole double-resonance study of random fields in

Abstract

The second moment of the local polarization distribution W(p) has been measure in as a function of temperature by a nuclear-quadrupole double-resonance technique. The temperature variation of is well described by a dynamic disorder of randomly asymmetric O - H...O hydrogen bonds. The variance of the Gaussian distribution of random fields which induce the asymmetry of the O - H...O hydrogen bonds is equal to .