High resolution double-resonance spectroscopy on Rydberg states of CO

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Abstract
The Rydberg states L 1Π(v=0), L′ 1Π(v=1), K 1Σ+(v=0), W 1Π(v=0), and W′ 1Π(v=2) have been studied in a 2+1 double-resonance detection scheme with a resolution of 0.005 cm−1. Accurate molecular constants have been derived for these states. From the observed linewidths of individual rotational transitions, predissociation rates for the Rydberg states have been deduced. For the first time a clear J and e/f dependence for the predissociation of CO has been observed. One of the states causing the observed predissociation could be identified as the D′ 1Σ+ state.