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The charge-transfer spectra of MnCl2, FeCl2, CoCl2, and NiCl2 molecules isolated in argon matrices near 4.2°K have been measured. The results are consistent with the d-configuration ground states Σ6, Δ5, Φ4, and π3 deduced in earlier work from gas-phase Laporte-forbidden absorption spectra of these molecules.
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DeKock et al. (1968) studied this question.
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