Prediction of low energy molecular Rydberg states from Feshbach resonance spectra

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Abstract
An electron transmission spectrometer is used to study Feshbach resonances in CH3X(X=Cl, Br, I). Combination of data obtained an HX and CH3X indicates a linear relationship between resonance energies Enll′(m) and the corresponding ionization potential I (m) given by Enll′(m) =Anll′I (m)+Bnll′ where Anll′ and Bnll′ are constants independent of molecular species m, and l and l′ are angular momentum quantum numbers of the two excited electrons. In addition to predicting the positions of Feshbach resonances, this relation may be used together with a screening factor σ to calculate the energies of energetically low lying Rydberg states in structurally related molecules. This technique is at least as accurate as a previous technique which calculates Rydberg energies from correlations with Rydberg energies determined in other molecules.