Summary
The spectra of octahedral cobalt(II) species in sodium ultraphosphate glasses show the two-electron transition,4 T 1g (F) →4 A 2g (F), as a resolved band, separate from the intense one-electron transition4 T 1g (F) →4 T 1g (P), which normally masks it in the visible spectra of cobalt(II) hydrates.
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Askalani, P. The two-electron transition,4 T 1g (F) →4A2g(F), in the spectra of octahedral oxygen-coordinated cobalt(II) species. Transition Met Chem 11, 469–471 (1986). https://doi.org/10.1007/BF01386879
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DOI: https://doi.org/10.1007/BF01386879