A method is described which yields an accuracy of within about ± 1% in the measurement of attenuation constants of the order 0.01 cm-1 to 0.5 cm-1. Accurate results for water are obtained, contributing to the data available for this liquid at 21°C. In addition, some results for the absorption coefficient and dielectric constant of dilute solutions of water, and of ethyl alcohol in dioxan are provided.
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V I Little (1953) studied this question.
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