Abstract
True potential energy curves have been calculated for the A and X states of BiF and PbF molecules using the Rydberg–Klein–Rees (R.K.R.) method as modified by Vanderslice et al. It has already been shown that by fitting an empirical potential function to the actual potential (R.K.R.) curve of a state we can obtain an idea of the correct dissociation energy of the molecule in that particular state. The three-parameter Lippincott function has been used for this purpose. The resulting dissociation energies for the ground states of PbF and BiF are (2.4 ± 0.2) eV and (2.60 ± 0.2) eV respectively. In PbF a large number of band systems are known, two of which show predissociation in the upper excited state. It has been found possible to account for both of these predissociations in PbF as being due to the A state of the molecule.
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