Knowledge Bank

The emission spectrum of CoCl has been recorded in the 2000--20000 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ region using a Fourier transform spectrometer. The bands were excited in a carbon tube furnace by heating CoCl$2$ to a temperature of about 2200C. The bands observed in the 2000--12000 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ interval have been classified into three transitions: $G3\Phi -X3\Phi$, $C3\Delta -X3\Phi$ and $G3\Phi -C3\Delta$, analogous to the near infrared transitions of CoF [R. S. Ram, P. F. Bernath and S. P. Davis, J. Chem. Phys. 104, 6949 (1996)]. Two sub-bands with 0--0 origins near 10486.9 and 10449.9 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ have been assigned as the $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Phi 3-3\Phi 3$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Phi 4-3\Phi 4$ sub-bands of the $G3\Phi -X3\Phi$ transition. Two other 0--0 bands with origins near 2636.6 and 2726.7 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ have been assigned as $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Delta 2-3\Phi 3$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Delta 3-3\Phi 4$ sub-bands of the $C3\Delta -X3\Phi$ transition. In addition, two very weak bands observed with origins near 7850.3 and 7723.2 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ have been identified as the 0--0 bands of the $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Phi 3-3\Delta 2$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Phi 4-3\Delta 3$ sub-bands of the $G3\Phi -C3\Delta$ transition. A rotational analysis of a number of vibrational bands of these transitions has been obtained and spectroscopic constants for the low-lying electronic states of CoCl have been determined.