An optical-optical double resonance technique has been used to study transfer between specific quantum levels in the A2Π and X2Σ2 states of the CN radical in collisions with argon. Specific rotational levels within the v = 7 A state vibrational level are prepared by laser excitation in the A-X (7,2) band, while collisionally populated levels in this vibrational level and the nearly isoenergetic v =11 level in the X state are probed by laser fluorescence excitation in the interleaved B-A (8,7) and B-X (8,11) bands. The collisional transfer rate from the relatively unperturbed N = 6 F1 λ-doublets to the X state is comparable to or faster than that for pure A → A inelastic transitions. A significant alternation in the population of even versus odd N levels in the X state is observed, related to the near-homonuclear character of the CN-Ar interaction potentials.
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Furio et al. (1986) studied this question.
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