Abstract
Five rotational transitions of CoH in its ground 3Φ state have been detected by far-infrared laser magnetic resonance, three in the lowest Ω = 4 component and two in the Ω = 3 component. All the Zeeman transitions show an octet hyperfine pattern due to the 59Co nucleus ( I = 7/2). The much smaller proton doubling was also resolved for most transitions. The data have been fitted to experimental accuracy by an effective Hamiltonian for a molecule in an isolated 3Φ state. The electron orbital and spin g factors determined by the data confirm conclusively that the ground state of CoH is a 3Φ state. The accurate measurement of the rotational constant allows the equilibrium bond length to be determined: r e = 0.15138435(80) nm. A small Λ-type doubling was resolved in the 3Φ 3 component, suggesting the proximity of a 3Σ state among the low-lying electronic states. The cobalt hyperfine splittings have been fitted to determine magnetic dipole and electric quadrupole parameters, which are interpreted in terms of the dominant configuration description for the 3Φ ground state.
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