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Abstract
The CH radical has been detected in its a 4Σ− state by the technique of laser magnetic resonance at far-infrared wavelengths. Spectra relating to different spin components of the first three rotational transitions have been recorded. The molecule was generated either by the reaction of F atoms with CH4, with a trace of added oxygen or by the reaction of O atoms with C2H2. The observed resonances have been analyzed and fitted to determine the parameters of an effective Hamiltonian for a molecule in a 4Σ state. The principal quantities determined are the rotational constant B0=451 138.434(94) MHz and the spin–spin parameter λ0=2785.83(18) MHz. Proton hyperfine parameters have also been determined.
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