Knowledge Bank

Electronic transition of cobalt monochloride and monoiodide have been studied using laser vaporization/reaction free jet expansion and laser induced fluorescence in the near infrared region. The observed transitions were characterized as the $[10.3]3\Phi 4-X3\Phi 4$ transition of CoCl and the $[11.0]3\Phi 4-X3\Phi 4$ transition of CoI. Magnetic hyperfine structure resulting from the cobalt nucleus with I = 7/2 have been observed and analyzed. Accurate rotational and hyperfine parameters for both of the upper and lower $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Phi 4$ states of CoCl and CoI have been determined. Comparison of Fermi contact parameter $bF$ for the upper states indicated that the observed transitions are arisen from the promotion of electron between $\sigma \to \sigma$ orbitals.