Ir4+, incorporated on the octahedral a-sites of Y3Ga50,,:Ir, has been investigated by electron spin resonance a t 9 and 35 GHz, and by optical absorption spectroscopy in the range 5000 to 6000 cm-l. For an unequivocal optical identification Zeeman measurements were performed. I n t h e same energy range fluorescence from Ir4+ could be observed. Analysis of the data obtained b y electron spin resonance and optical techniques reveals that the properties of the ,Tzg ground state of Ir4+ are partly determined by interaction with higher excited states.

Optical absorption and Faraday rotation of yttrium iron garnet have been investigated in the spectral range of 1 to 0.35 pm, a t 300, 20, and 6 K. At wavelengths shorter than 0.7 pm the spectra were taken on thin films epitaxially grown on gadolinium-gallium garnet substrate.Optische Absorption and Faradaydrehung in Yttrium-Eisen-Granat wurden im Spektralbereich von 1 bis 0.35 pm analysiert, bei Temperaturen von 300, 20 und 6 K. Fur Wellenlangen kiirzer als 0,7 pm wurden die Spektren an YIG-Dunnfilmen aufgenommen, die epitaktisch auf Gadolinium-Gallium-Granat-Substrat gewachsen waren.

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