Debye relaxation simple water molecules

Pure liquids - water and alcohols Water and peroxides (HO-OH) represent a limiting state of such interactions. In the liquids state, water molecules associate by hydrogen-bond formation. Despite its apparently complex molecular structure, because of its strong association, water closely followed simple Debye relaxation (at 25 °C sr = 78.2, ooj = 5.5, t = 6.8 x 10 s, and h = 0.02, the Cole-Cole term). 

Equation (31) assumes an existence of two kinds of molecules showing quite different reorientational dynamics in the considered time interval. The water molecules with strong retardation of rotational motion and with broad distribution of relaxation times (low value of P) should be considered strongly bound. Such kind of water molecules with similar low values of the stretching exponent were observed in neutron-scattering experiment for combined rotational-translational motion of water in hydrated myoglobin (P 0.3) [643] and in simulations of water near mica surface (P k 0.25) [652]. Those water molecules, which show simple one-term exponential relaxation, like in the bulk, should be considered as weakly bound. Fractions of these two kinds of molecules ((1 - a) and a, respectively) should depend on the hydration level. Note, that weakly bound water molecules with Debye rotational relaxation were not distinguished in other simulation studies [610, 644]. 

---