Abstract

By means of a phase contrast refractometer, a new tool with a precision in optical path determination of the order of λ/1000, the refractivity function of the mixture heavy-light water has been determined, and is, for 5461A light, at 22.75°C, and within the mole fraction x<0.04 so far examined, − Δn(x)×104 =47.55x+5.8x2. It is possible to use this optical method for analysis and control of the contents of D2O to within about 0.002 mole percent at all concentrations.

© 1954 Optical Society of America

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