Abstract
Doppler-free UV-excitation spectra, obtained by modulated population spectroscopy, reveal perturbations of a few hundred e levels of the C1Πu state in Na2. We ascribe the perturbations to the state. After deperturbation, information about 15 vibrational levels of the state was extracted. This information was used to deduce a set of Dunham coefficients and the Rydberg–Klein–Rees potential for the state. The experimental results show that the potential of the state is one with a double minimum or an inflection. In addition, it has a flattened bottom with Te = 31 247.82 cm−1. As a consequence, the vibrational spacing at first increases and then decreases as a function of υ. Comparison of the experimental results and theoretical calculations yielded fairly good agreement.
© 1989 Optical Society of America
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