Mass Spectrometric Measurement of Diffusion Coefficients

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Binary diffusion coefficients of CH4–CO, CH4–N2, CH4–CF4, CH2CH2–N2, CH3CH3–CH2CH2, CH3CH3–CHCH, CH2CH2–CH3CH3 have been measured at 298.2°, 353.6°, and 382.6°K. By means of isotopic substitution, the self-diffusion coefficients of CH4, CH3CH3, CH2CH2, and CHCH have been determined at the same temperatures. In general, the depth of the potential minimum, ε, was less, when calculated from diffusion measurements, than when calculated from virial coefficients or viscosity measurements.