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Originalpublikation
Dorfmüller, T. & Göpel, W.: Die Zustandsgleichung isotoper Äthylene. In: Zeitschrift für Naturforschung A 24 (1969), S. 852-854. DOI: https://doi.org/10.1515/zna-1969-0525
The second virial coefficients of C2H4 and C.D4 have been measured at 236.04 K. The experimental isotope etlect of 1.07% can he separated into one contribution from a translational quantum effect and one contribution which is due to the different molar volumes of the isotopes. In this temperature region the isotope effect is shown to be mainly a volume effect. This explanation is confirmed by results from molar volume measurements of the liquid isotopes.