High accuracy submillimetre-wave solution measurements

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Abstract
Submillimetre-wave measurements of the power absorption coefficient alpha and refractive index n of room temperature solutions of p-difluorobenzene in nonpolar solvents are reported. A room temperature detector was used and careful precautions, which included phase modulation, have given very small estimated uncertainties: as low as +or-0.1% in alpha and +or-0.02% in n. Some variations with molar concentration are given.