Permittivity of Pure Water, at Standard Atmospheric Pressure, over the Frequency Range –25THz and the Temperature Range –100°C

2007/02/08 by W. J. Ellison · 6 citations
Engineering · Environmental Science · #Acoustic Wave Resonator Technologies #Microwave and Dielectric Measurement Techniques #Soil Moisture and Remote Sensing

paper · doi:10.1063/1.2360986

openalex publication_date 2007/02/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31

Abstract

All the currently available experimental permittivity data for pure water are used to derive an interpolation function that precisely represents ε(ν,t,) at standard atmospheric pressure, for frequencies and temperatures in the ranges 0⩽ν⩽25THz and 0⩽t⩽100°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°C the three relaxation frequencies are 18.56GHz, 167.83GHz, 1.944THz and the two resonance frequencies are 4.03 and 14.48THz.

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