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Optical Absorption Spectrum of Iron in Garnet

The optical absorption spectrum of garnet has been studied at room and liquid air temperatures. For the first time the ion responsible for the bands has been identified from spectrochemical and Mossbauer spectral studies as Fe3+. The cubic field approximation with Dq = 1000 cm−1, B = 650 cm−1, and C = 4 B is found to give a good fit to the observed band positions.