Hyperfine coupling constants of the CCN radical in the à 2Δ(000) state by microwave–optical double resonance spectroscopy

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Abstract
Electric‐dipole allowed transitions between hyperfine components and between rotational levels have been observed for CCN in the à 2Δ(000) state by a technique of microwave–optical double resonance. The observed transition frequencies have been analyzed to yield 14N hyperfine coupling constants: a=50.22(19), b=−5.9(12), c=7.8(20), and eQq=0.75(54), all in MHz with one standard error in parentheses. An attempt was made to observe Λ‐doubling transitions and rotational transitions in the X̂ 2Π(000) state without success.