where the c s and τ s term includes intermittent breakage of hydrogen bonds resulting from librational motion within a short time, and the c l and τ l term considers complete breakage beyond the libration. Plots of C(t) for water in Ho-(DBM) 3 • H 2 O and bulk liquid are dis-played in Fig. as solid lines; these correspond to the fitting results from Eq. ( ). It can be seen that the hydrogen-bond dynamics are well modeled with this function.