Abstract
Radio brightness characteristics of aqueous solutions of salts with multiply charged cations in the millimeter band were studied by a highly sensitive radiometer at a frequency of 61.2 GHz under laboratory conditions. The experimental data were compared with the data calculated from dielectric spectra in the millimeter and centimeter bands. It was shown that, even in the millimeter band, it is necessary to take into account the spectral contributions of both dipole and ionic losses. By the example of solutions of chlorides of magnesium, manganese, and aluminum, it was found that the experimental and calculated radio brightness parameters agree in the initial concentration range, where hydration changes in water in solutions of salts dominate. It was determined that, unlike solutions with weakly hydrated ions, e.g., potassium chloride solutions, the intrinsic radiation of the above solutions is stronger than that of water. The second contribution is significantly responsible for different signs of the changes. The experimentally observed characteristics of the intrinsic radiation of solutions were substantiated based on the extremely-high-frequency dielectric data.
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