FOURIER TRANSFORM EMISSION SPECTROSCOPY OF THE $G\;^{3}\Phi - X\;^{3}\Phi$, $C\;^{3}\Delta - X\;^{3}\Phi$ AND $G\;^{3}\Phi - C\;^{3}\Delta$ SYSTEMS OF CoCl

Author Institution: Department of Chemistry, University of Arizona, Tucson, AZ; 85721; Department of Physics, University of Waterloo, Waterloo,; Ont., Canada N2L 3G1; Department of Chemistry, University of Waterloo, Waterloo,; Ont., Canada N2L 3G1; Laboratoire PhLAM, UMR CNRS 8523, Centre d'Etudes et de; Recherches Lasers et Applications, Universite des Sciences et; Technologies de Lille, 59655 Villeneuve d'Ascq Cedex, FranceThe emission spectrum of CoCl has been recorded in the 2000--20000 cm$^{- 1}$ region using a Fourier transform spectrometer. The bands were excited in a carbon tube furnace by heating CoCl$_2$ to a temperature of about 2200$^{irc}$C. The bands observed in the 2000--12000 cm$^{-1}$ interval have been classified into three transitions: $G\;^{3}\Phi - X\;^{3}\Phi$, $C\;^{3}\Delta - X\;^{3}\Phi$ and $G\;^{3}\Phi - C\;^{3}\Delta$, 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$^{- 1}$ have been assigned as the $^{3}\Phi_{3} - ^{3}\Phi_{3}$ and $^{3}\Phi_{4} - ^{3}\Phi_{4}$ sub-bands of the $G\;^{3}\Phi - X\;^{3}\Phi$ transition. Two other 0--0 bands with origins near 2636.6 and 2726.7 cm$^{-1}$ have been assigned as $^{3}\Delta_{2} - ^{3}\Phi_{3}$ and $^{3}\Delta_{3} - ^{3}\Phi_{4}$ sub-bands of the $C\;^{3}\Delta - X\;^{3}\Phi$ transition. In addition, two very weak bands observed with origins near 7850.3 and 7723.2 cm$^{-1}$ have been identified as the 0--0 bands of the $^{3}\Phi_{3} - ^{3}\Delta_{2}$ and $^{3}\Phi_{4} - ^{3}\Delta_{3}$ sub-bands of the $G\;^{3}\Phi - C\;^{3}\Delta$ 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