The large differences in thermodynamic properties of the isotopic NO molecules are interpreted in terms of the known structure of interacting dimers. It is shown that structural considerations alone suffice to calculate the relative O18 to N15 isotope effects on vapor pressure, heats of vaporization, and triple points. The calculated relative quantities are in excellent agreement with experiment. The properties of N15O18 are shown to be completely determined by those of N14O16, N15O16, and N14O18. The absolute value of the vapor pressure ratio of N14O16/N15O16 is calculated from spectral data in good agreement with experiment.
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Jacob Bigeleisen (1960) studied this question.
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