We studied the metal d and 0 2pderived electronic states of RuO» IrO» Ru065Ir03$02 arid Ru077Ilp 2302 by photoemission spectroscopy with synchrotron radiation. Our data are in qualitative agreement with the Ru02 and Ir02 density-of-states curves calculated by Mattheis, which consist of one d-electron peak and three other major peaks with prevailing 0 2p character. The quantitative agreement is reasonably good for Ru0» while discrepancies exist for the lower-energy states of Ir02. Revelation of these discrepancies, not evident from previous photoemission studies, was made possible by the investigation of mixed Ru02-Ir02 crystals.

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