Abstract
High resolution absorption spectra of the C 1Πu←X 1Σg+ transition of the Na232 molecule have been measured in the range 29 680–30 950 cm−1 by exploiting the technique of Doppler-free UV-visible optical–optical double resonance polarization spectroscopy. The molecular constants of the C 1Πu(v=0–10) levels are determined, and the Rydberg–Klein–Rees potential energy curve is calculated. A number of C 1Πu(v=0–9,Je and f ) levels were found to be perturbed. The energy shifts of e and f parity levels of the C 1Πu state were studied and identified as originating from perturbations between the C 1Πu and 3 3Σu+ states. Remarkable line broadenings were observed only in the perturbed region and identified as the lifetime broadening effect originating from indirect (accidental) predissociation through the two diabatic Σ3u+ states.
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