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Experimental observation of the ( 3 ) Σ 1 u + state of Na2 by deperturbation of the C Π 1 u X Σ 1 g + system

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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 (3)Σ1u+ state. After deperturbation, information about 15 vibrational levels of the (3)Σ1u+ 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 (3)Σ1u+ 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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