Radio Brightness Contrasts of Aqueous Solutions of Alkali Metal Hydroxides in the Millimeter Spectral Range.

Using a high-sensitivity radiometer at a frequency of 61.2 GHz (millimeter spectral range), the radio brightness characteristics of aqueous solutions of alkalis (KOH, NaOH) have been studied under laboratory conditions. The radio brightness parameters have been compared with calculated data from dielectric spectra in the millimeter range. Using KOH solutions as an example, a correspondence between the experimental and calculated radio brightness parameters in the initial concentration range, where hydration changes in water in solutions predominate, has been revealed. It has been established that even in the millimeter range it is necessary to consider the spectral contributions of both dipole and ion losses. [ABSTRACT FROM AUTHOR]