Time resolution of dispersed laser-induced fluorescence of the A2Δ–X2Π origin band of CH has been used to measure rates of rotational energy transfer within the A2Δ state. The dominant collision partner is helium at ambient temperature. Transfers with |ΔN|= 1 have the highest probability. The measured rates are adequately represented by the energy corrected sudden scaling law (ECS-P model). The rate constant for total transfer out of the lower rotational levels (ca. 0.9 × 10–10 cm3 s–1) is close to gas-kinetic.
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Dixon et al. (1987) studied this question.
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