Abstract
A fast and efficient method using the spectral moments of an electronic—vibrational spectrum is described to determine the harmonic and Morse potential fits to the excited state potential in the Franck—Condon region. Some of the drawbacks of the Franck—Condon least-squares fitting procedure are overcome by the moment method. The method is applied to some diatomics of current interest, spanning a wide range of bond length change in the electronic transition. The accuracy of the results suggests that the spectral moment method can be a replacement for the traditional and still popular Franck—Condon analysis.
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