High-Resolution Visible Laser Spectroscopy of Cobalt Monochloride

Fourier transform emission spectroscopy of the C3Δ–X3Φ, D3Δ–X3Φ, G3Φ–X3Φ and G3Φ–C3Δ systems of CoCl

“…Although several visible transitions of CoCl have been studied at high resolution previously [21,22], the red and near infrared regions remained largely unexplored: only the 3 U 4 -3 U 4 subband of the G 3 U-X 3 U transition was observed previously by Wong et al [23]. In that work the authors observed the v = 0 the vibrational level in the X 3 U 4 state and v = 2-7 vibrational levels in the G 3 U 4 spin component [labeled by them as [10.3] …”

“…Thus the identity of even the ground state of CoCl remained uncertain mainly due to the lack of high resolution data. More recently, Adam et al [21] reported the observation of two electronic transitions in the 415-725 nm region in a laser-induced fluorescence experiment using laser-ablation/molecular beam source and concluded that the ground state of CoCl indeed arose from a X 3 U 4 state consistent with the results available for CoF. In a subsequent investigation of CoCl, Hirao et al [22] recorded the spectrum in same region as studied by Adam et al [21] and reported additional bands having the X 3 U 3 spin component of the ground state as the lower state.…”

“…More recently, Adam et al [21] reported the observation of two electronic transitions in the 415-725 nm region in a laser-induced fluorescence experiment using laser-ablation/molecular beam source and concluded that the ground state of CoCl indeed arose from a X 3 U 4 state consistent with the results available for CoF. In a subsequent investigation of CoCl, Hirao et al [22] recorded the spectrum in same region as studied by Adam et al [21] and reported additional bands having the X 3 U 3 spin component of the ground state as the lower state. In another study of this molecule, Wong et al [23] applied the laser vaporization free jet expansion/laser excitation technique to observe a 3 U 4 -3 U 4 subband in the near infrared which they labeled as the [10.3] 3 U-X 3 U transition.…”

Rotational and hyperfine analysis of the near infrared Φ43–X 3Φ4 transitions of CoCl and CoI

“…The ͓20.7͔ 3 ⌽ 4 -X 3 ⌽ 4 and ͓21.3͔ 3 ⌽ 4 -X 3 ⌽ 4 transitions of CoCl were suggested by Adam et al 16 using laser induced fluorescence spectroscopy that these transitions arise from the promotion of an electron from the 11→12 molecular orbital. However, recent FTS work of Hirao et al 17 indicated that the upper state of the ͓21.3͔ transition is probably 3 ⌬ i state but the 3 ⌽ i assignment of Adam et al 16 could not be definitely ruled out. The electronic configurations suggested by Adam et al 16 for the lower and upper states are as follows:…”

“…However, recent FTS work of Hirao et al 17 indicated that the upper state of the ͓21.3͔ transition is probably 3 ⌬ i state but the 3 ⌽ i assignment of Adam et al 16 could not be definitely ruled out. The electronic configurations suggested by Adam et al 16 for the lower and upper states are as follows:…”