HYPERFINE STRUCTURE OF THE NEAR INFRARED TRANSITIONS OF CoI AND CoCl

Author Institution: Department of Chemistry, The University of Hong KongElectronic 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 $[10.3] ^{3}\Phi_{4} - X^{3}\Phi_{4}$ transition of CoCl and the $[11.0]^{3}\Phi_{4} - X^{3}\Phi_{4}$ 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 $^{3}\Phi_{4}$ states of CoCl and CoI have been determined. Comparison of Fermi contact parameter $b_{F}$ for the upper states indicated that the observed transitions are arisen from the promotion of electron between $\sigma \rightarrow \sigma$ orbitals