Empirical Potentials and Related Topics

Fmpirical Potentials and Related Topics.—Although this review mainly deals with the calculation of intermolecular potentials either ab initio, or at least from parameters such as sum rules which are derived from experiments not directly concerned with molecular interactions, nevertheless, there have recently been so many attempts to derive more accurate empirical potentials (with which any calculation must be compared) from new experimental data that it seems appropriate to mention some of this work. 

The noble gases have received most attention. New evidence which has been obtained from the spectra of the van der Waals molecules involving these atoms has been reported.122-123 From this and other data, potential curves have been obtained 

Spectral data on a wide variety of van der Waals molecules arc now becoming available. The noble-gas dimers have already been mentioned, but many others are now yielding detailed data on, especially, the angular dependence of potentials, which 

The long-range part of the halogen-halogen potential correlating with the B3ITou excited state of the diatomic molecule has been obtained by the RKR method, yielding C5, Cz, and C coefficients for I -I,143 Br- -Br, and Cl- C1.144 

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