The pure rotational spectrum and hyperfine structure of CF studied by laser magnetic resonance

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Abstract
Laser magnetic resonance spectra have been measured for four rotational transitions and one spin‐changing transition in the 2Π ground state of CF, generated in an intracavity methane–fluorine flame. From a detailed analysis of the Zeemanhyperfine structure of the J = 9/2→11/2 transition in the Ω = 3/2 spin component the hyperfine constants h, b, and d as well as B 0 and q 0 have been determined. Using these fitted parameters in conjunction with a b i n i t i o results, the values of 〈1/r 3〉, 〈(3 cos2ϑ−1)/r 3〉, ‖ψ2(0)‖, and 〈(sin2ϑ)/r 3〉, averaged over the unpaired electron distribution, have been determined. Comparison of these integrals with those of the fluorine atom indicates that the unpaired electron has approximately 18% F character, implying a substantial degree of double bonding.