Abstract
An optical-optical double resonance technique has been used to study transfer between specific quantum levels in the A 2Π and X 2Σ 2 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 F 1 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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