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

The emission spectrum of CoCl has been recorded in the 2000-23 000 cm−1 region at high resolution. CoCl was made in a carbon tube furnace by heating cobalt metal to a temperature of about 2300 °C as well as in a DC discharge source and the spectra were observed using a Fourier transform spectrometer. The bands observed in the 2000-13 000 cm−1 interval have been classified into four transitions: C3Δ-X3Φ (2500-3600 cm−1), D3Δ-X3Φ (9300-10 030 cm−1), G3Φ-X3Φ (8500-13 000 cm−1) and G3Φ-C3Δ (7400-7900 cm−1) analogous to the near infrared transitions of CoF reported previously [R.S. Ram, P.F. Bernath, S.P. Davis, J. Chem. Phys. 104 (1996) 6949.]. A rotational analysis of a number of vibrational bands of these transitions has been obtained and spectroscopic constants extracted for the low-lying electronic states of CoCl. It is found that the energy levels of CoCl correlate very well with those of CoF and CoH.