The lowest excited states of a chromate derivative. Resolved optical and odmr spectra of RbCrO3Cl AND CsCrO3Cl at 1.4 K

The phosphorescence, excitation and absorption spectra of the CrO₃Cl⁻ anion in its neat rubidium and cesium salts at 1.4 K are reported. The spectra show sharp zero-phonon lines, which allow vibronic analyses of the phosphorescence spectra based on the respective Raman spectra. The zero-field splittings and lifetimes of the spin-triplet state of CrO₃Cl⁻ anion in each of the salts have also been obtained. The results are compared with earlier results for the potassium salt.