Abstract

A variable-length reflection cell is employed in the free-space determination of the complex index of refraction of liquids at mm wavelengths. Explicit expressions are obtained for both the ordinary index of refraction η and the extinction coefficient κ.

The results of measurements on toluene, dioxane, and cyclohexane are reported for wavelengths of 4.2 mm, 3.2 mm, 2.5 mm, and 1.8 mm.

© 1959 Optical Society of America

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