Ground-state reduced potential curves (RPC) of very heavy molecules, Bi2and Pb2

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Abstract
Ground-state reduced potential curves (RPC) of Bi2 and Pb2 are calculated using recent spectroscopic data. The results confirm the general rules of the RPC scheme, thus proving their validity also for very heavy molecules. It is shown that the prediction of an error in the previous analysis of the spectrum of Bi2 and in the corresponding internuclear potential of this molecule on the basis of the RPC method was correct. This results illustrates the efficiency of the application of the RPC method for a critical evaluation of the analysis of the spectra and of the values of spectroscopic constants, and eventually for a detection of errors in the internuclear potentials.