Abstract
Double-resonance spectroscopy is used to investigate the v′ = 2 level of the b 3Σ + state and perturbing high vibrational levels ( v′ = 40-42) of the a′ 3Σ + state of CO. Single rotational levels in the a 3Π( v = 0) state are prepared via laser excitation on the Cameron band around 206 nm. Cavity-ring-down absorption spectroscopy is used to determine the absolute transition strength of this spin-forbidden transition; a value of A 0.0 = 41 ± 10 sec −1 is obtained. A laser-induced fluorescence study is performed on the metastable triplet state molecules in the region of the 2 ← 0 band of the Third Positive System of CO. From the analysis of the interacting 3Σ + states deperturbed rotational and vibrational constants as well as interaction parameters of these states are obtained. Franck-Condon factors for the transition from b 3Σ +( v′ = 2) and ( v′ = 0) to the a 3Π state are obtained from dispersion measurements.
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