Vapor pressures of isotopic molecules^*

Chemistry Department, Brookhaven National Laboratory, Upton, L. I., New York, U.S.A., U.S.A..

Abstract

It is apparent that major progress has been made both in the experimental and theoretical study of the vapor pressures of isotopic molecules in the last five years. Vapor pressure measurements are being made in different laboratories by different methods which agree with one another within a few hundredths of one percent. The theory has advanced to the point where a large body of experimental data can be systematized and understood. Quantitative calculations have been carried out which verify the mass, temperature, and potential energy dependence aspects of the theory. An old subject has been revived by advances in modern experimental and theoretical methods and is now useful for the study of quantum effects and structural effects in liquids and solids.