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A variable space liquid absorption cell is described for use in the infra-red spectral region. Its range of thicknesses from 5 mm to less than 10 μ makes it suitable for the compensation of absorption by solvents in a double beam spectrophotometer; its accuracy and reproducibility are sufficient for most direct qualitative and quantitative measurements. The minimum volume is approximately one cc, and the leakage is negligible. Its windows of rocksalt may easily be removed and repolished.
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John U. White (1950) studied this question.
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