Abstract
Vibrational excitation of CO by 3 keV H +, He +, N +, O +, Cl + and Ar + ions has been investigated by high resolution translational energy spectroscopy. The vibrational structures for the observed X 1Σ + → A 1Π and X 1Σ + → a 3Π r transitions of CO are clearly resolved, and the various reaction channels are unambiguously identified. The projectile ions are deliberately chosen for their distinctly different valence electronic configurations in a systematic study of the Winger spin conservation rule. In all ion-atom/molecule collisions involving simultaneous transitions in both partners, spin conservation dictates that a single-triplet (or doublet-quartet) transition in one partner necessitates observance of the following selection rule by the other collision partner: Δ S = 0, ± 1 with singlet-singlet transition forbidden. In every instance where CO molecule undergoes a X 1Σ + → a 3Π r transition, this selection rule appears to be observed rigorously by the atomic ion.
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