Non-ideality of an 'ideal' liquid mixture: (36Ar + 40Ar)

Jorge Carreira Gonçalves Calado, Florbela A. Dias, José N. Canogia Lopes, Manuel Nunes da Ponte, Luís P. N. Rebelo

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


A mixture of two isotopes of the same rare gas represents the extreme case of molecular simplicity. In this work, the excess molar Gibbs energies for liquid mixtures of (36Ar + 40Ar) have been measured for the first time, with unprecedented precision. Results show that the excess vapour pressure of an equimolar mixture is approximately 2.5 Pa in the 85-96 K temperature range. The results are well predicted by a modified version of the quantum theory of isotope effects in mixtures.

Original languageEnglish
Pages (from-to)1095-1097
Number of pages3
JournalPhysical Chemistry Chemical Physics
Issue number5
Publication statusPublished - 1 Mar 2000


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