Perturbahon Theory

A further issue for review is the treatment of attractive interactions. The treatment here was limited to consideration of the second virial coefficient as in Eq. (4.46), and this implies the composition and temperature dependences exhibited in Eq. (4.49). Those composition and temperature dependences are certainly the leading factors, but a more general evaluahon of first-order perturbahon theory could result in subtle corrections to those dependences. Additionally, some implicit temperature and pressure dependence is implied by the variations of the pure liquid properties in those factors. Finally, the limitation of the hrst-order perturbation theory must also be borne in mind there are experimental cases where hrst-order perturbation theory appears to be unsatisfactory (Lefebvre et al, 1999). 

Symmetry-Adapted Perturbahon Theory A perturbahonal method of calcu-lahng intermolecular interachon energy while taking into account the Pauli exclusion principle. 

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