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| - Vapor Pressure and Related Thermodynamic Properties of 36Ar
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| - The 36Ar−40Ar vapor pressure isotope effect in the liquid and solid phases has been experimentally determinedat about 100 temperatures between 83 and 97 K using a high-accuracy double-differential manometric technique.Differences between the vapor pressure of a highly enriched sample of 36Ar and that of natural argon weremeasured simultaneously with the absolute vapor pressure of natural argon. Absolute and differential vaporpressure measurements show an estimated accuracy of 0.15% and 0.001%, respectively, with respect to theabsolute vapor pressure of argon. Data were obtained in both the solid and liquid regions. The vapor pressureof 36Ar is always higher than that of 40Ar by about 0.5%. Triple-point temperatures and pressures were alsomeasured for both isotopes. All data compare favorably with previous results reported in the literature andare nicely interpreted within the framework of Bigeleisen's theory of isotope effects. Using a large temperatureextrapolation of our data, liquid−vapor isotope fractionation factors were successfully inferred from the vaporpressure measurements; the estimated values agree with the experimental ones up to close to the criticalpoint. The isotopic difference in the molar enthalpies of vaporization and sublimation was also calculatedfrom the vapor pressure data. Additionally, molar volume and second virial coefficient isotope effects areestimated using several different theoretical approaches.
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