Permittivity of pure water, at standard atmospheric pressure, over the frequency range 0-25 THz and the temperature range 0-100°C

All the currently available experimental permittivity data for pure water are used to derive an interpolation function that precisely represents epsilon(nu,t,) at standard atmospheric pressure, for frequencies and temperatures in the ranges 0 <=nu <= 25 THz and 0 <= t <= 100 degrees C. The permittivity data is represented in terms of relaxations and resonances processes. There are three relaxations in the microwave region and two resonances in the far infrared. The temperature dependence of the relaxation and resonance parameters are determined. For example, at 25 degrees C the three relaxation frequencies are 18.56 GHz, 167.83 GHz, 1.944 THz and the two resonance frequencies are 4.03 and 14.48 THz.(c) 2007 American Institute of Physics.