Pseudo-central Force Fields

Molecules with Pseudo-central Force Fields. Up until this point in the discussion, the potential energy of a pair of molecules has been taken to depend on the distance between their centres, and not on their mutual orientation. Interaction models that offer a semblance of orientational dependence yet retain the basic feature of central potentials (for reasons of 

Kihara supposed that molecules have impenetrable convex cores of volume Vq, surface area Jo, and mean curvature M. Interaction between two cores is held to foUow a 12 — 6 law involving / , the shortest distance between cores. Then 

Connolly and G. A. Kandalic, Phys. Fluids, 1960,3,463. (Also Documentation Institute, U.S. Library of Congress, Document No. 6307.) 

In summary, pseudo-central potentials with three disposable parameters offer powerful means of correlating and extrapolating measured B T) data for polyatomic gases. Accurate prediction of B T) data via these potentials seems a more remote prospect, though McKinley and Reed s approach is worthy of further investigation. 

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