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We report the observation of a resonance between hyperfine states, due to the crossing of rotational ladders at N=10 of Δ5/2 and Δ3/2 spin-doublet states in the excited A 2Δ state of CH. Accurate values for the hyperfine constants a, b, and c in the A 2Δ state were obtained. From measurements of the Λ-doublet splittings we estimate an upper limit to the Ëdoubling in the A 2Δ state

Hyperfine structure and Λ doubling in the A 2Δ state of CH: Observation of an internal hyperfine perturbation