Abstract
The formation of C 2 has been observed following the vibrational excitation of CO. Emission from four different electronic states has been observed: Swan bands (d 3 Π g → a 3 Π u); Deslandres-d'Azambuja bands (C 1 Π g → A 1 Π u); Fox-Herzberg bands (e 3 Π g → a 3 Π u) and a Mulliken band ( D 1Σ u + → X 1Σ g + ). The vibrational populations in the electronic states have been determined from low-resolution emission spectra. The time-resolved behaviour of the emissions indicates that the upper states close to the dissociation limit are populated first, while the lower electronic states are populated following a time delay. Formation mechanisms are discussed.
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