Microwave Absorption and Molecular Structure in Liquids. LXV. A Precise Michelson Interferometer for Millimeter Wavelengths and the Dielectric Constants and Losses of Some Low-Loss Liquids at 2.1 mm

Abstract

The theory and apparatus for a Michelson interferometer for the precise measurement of dielectric constant and loss of liquids at 2.1-mm wavelength are described. The probable error of the dielectric-constant measurements is 0.2%. The probable error of the loss measurements is 2% or ±0.0002, whichever is higher. The dielectric constants and losses of dilute solutions of chlorobenzene in benzene have been measured at 2.1-mm wavelength at 20° and compared in the light of existing lower-frequency data. The dielectric constants and losses of several nonpolar and slightly polar liquids have also been measured at 2.1-mm wavelength at 20°. The presence of appreciable losses in benzene and carbon tetrachloride has been confirmed. Measured losses in cyclohexane and n-heptane are considerably lower than those in benzene and carbon tetrachloride.

Molecular dynamics of methanol

“…Systems with a weak dipole-dipole coupling are known, however, to have ~i distribution of Debye times. The development of the millimeter wave dielectric measuring techniques by Smyth and his coworkers [23] made it possible for the discovery of a supplementary 'foot' on the high frequency side of the Cole-Cole plot for the higher series of the aliphatic alcohols [1]. This has been attributed to the ' internal rotation ' of the -OH segment with respect to the main molecular framework.…”

Collision-Induced Absorption in the Microwave Region

“…For nonpolar liquids, cavity (Bleaney et ale 1947), wave guide (Dagg and Reesor, 1963) and interferometer (Garg et al, 1965;Read et al, 1979) methods have been used in the microwave frequency region.…”

Dielectric and Association Behavior of 1-Propanol, 2-Propen-1-ol, and 2-Propyn-1-ol in Non-polar Solvents

“…The apparatus and procedure for determining the dielectric constant and loss at the frequencies (up to 10 in the range 1-145 GHz) employed in this study have been described previously (8)(9)(10) vacuum. This alcohol is insoluble in cyclohexane and tends to polymerize when allowed to stand in p-xylene solution.…”