Abstract
The Hamann-Lambert
model for globular molecules using Lennard-Jones 12- 6
potential functions for the atomic interactions has been used to obtain second
virial coefficients for CH4, CF4, SF6, SiF4, CMe4,
SiMe4, and the mixtures CH4-CF4,
CH4-SF6, CH4-CMe4,
CH4-SiMe4, and CF4-SF6.
Additive third virial coefficients have been computed where experimental data
are available. Of the 18 parameter sets needed for the 12-6 interactions in the
above molecules and their combinations ten were obtained by a least-squares
fitting process using experimental values of second virial coefficients, five
were obtained from combining rules, and the remaining three from sources
independent of virial coefficient data. The computed values of the virial coefficients
agree well with the experimental data although in the case of the third virial
coefficients improved agreement would be obtained if some form of
non-additivity could be allowed for.
Cited by
2 articles.
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