A critical angle refractometer for liquids in the infrared is described. Arsenic trisulfide prisms are used. In determining the critical angle of refraction, the influence of fringes formed in the thin sample layer is taken into account. Dispersion data are presented for six solvents in the 1–6 μ region. A summary is given of the sources of published data on the infrared dispersion of solvents.
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