Phosphorescence and optically detected magnetic resonance spectra of spin triplet states in neat KCrO₃F, KCrO₃Cl and K₂Cr₂O₇

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The emission spectra at ⩽ 4 K of neat KCrO3F and KCrO3Cl are reported and assigned as phosphorescence from the CrO3 X - chromophore. The zero field splittings (X = F and Cl) and kinetic parameters (X = Cl) of these and of the emissive spin triplet states in neat K2Cr2O7 are also determined by ODMR methods. The energies, mean lifetimes, and fine structure constants D of the triplet states in the three systems are very similar.