Abstract
A short tutorial is given on interactions of water with electromagnetic fields, particularly in the microwave frequency range. Properties of the water molecule are sketched and attributes of the percolating tetrahedral hydrogen bond network of liquid water are presented. Characteristics in the polarization noise of liquid water are discussed and are related to the dielectric spectrum of water. The principal dielectric relaxation in the microwave region is represented by a Debye-type spectrum, the parameter values of which are given as a function of temperature in tabular form. At 19°C, as an example, the complex dielectric water spectrum is shown in an extended frequency range, also covering the near millimetre and submillimetre wave region up to 2 THz. A wait-and-switch model of dielectric relaxation, as suggested by computer simulation studies, is briefly outlined, in order to illustrate the mechanisms behind the hydrogen network fluctuations.
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