A study of the infrared and Raman spectra of single crystals and powders of ZnGazOe yields the following k = O phonon frequencies: 175 cm-I (TlU), 328 cm-l (Tiu), 420 cm-l (Tiu), 570 cm-l (TlU), 467 cm-l (TzS), 611 cm-l ( T z~) , 638 cm-l (Eg) and 714 cm-l ( A I~) .The results are compared with the frequencies of the vibronic sidebands of the Cr3+ R line emission as observed in ZnGazO4: Cr3+. It is found that the strongest vibronics of the R lines are due to coupling of the Cr3+ electrons with the TllL modes of the ZnGazOe lattice, especially with the two higher frequency Tllc modes.
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