The absorption spectrum of CoCl<sub>2</sub> molecules isolated in a nitrogen matrix and the fluorescence spectrum of CoCl<sub>2</sub> molecules isolated in an argon matrix have been measured at liquid helium temperatures in the range 4000–50 000 cm<sup>−1</sup>. The absorption and fluorescence spectra in the 4000–25 000 cm<sup>−1</sup> region were not mutually observable in the same host. Interpretations of the spectra are given, based on axial ligand field calculations for a 3d<sup>7</sup> configuration including spin-orbit coupling interactions.

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