Abstract
Rhenium surface species, derived by treating [H,Re,(CO),,] adsorbed on y-A1203 in hydrogen at 400 'C, formed extremely
small surface grouping of rhenium atoms having an average Re-Re coordination number of 2, as determined by extended
X-ray absorption fine structure (EXAFS) spectroscopy. Results of X-ray photoelectron spectroscopy and threshold resonance
experiments show that the
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