Microwave Absorption and Molecular Structure in Liquids. XLIV. Investigation of Dielectric Relaxation by an Interferometric Method for the Measurement of Dielectric Constant and Loss at 2.2-mm Wavelength

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Abstract
The theory and apparatus for an interferometric method for the measurement of the dielectric constant and loss of a liquid at 2.2‐mm wavelength are described. The probable error of the dielectric constant measurements is 2%. The probable error of the loss measurements is 2–5%, increasing for high‐loss materials. The dielectric constants and losses of chlorobenzene, phenyl ether, and benzophenone have been measured at 2.2‐mm wavelength at temperatures between 21.5° and 60°. The results are examined in the light of existing lower‐frequency data. The presence of a second dispersion region for benzophenone has been confirmed. The observed losses at 2.2‐mm wavelength are slightly higher than extrapolation of lower‐frequency data would predict.