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Ammonia oxidation was studied in situ on Ir(110) and Ir(111) under low-pressure (∼10−7mbar) conditions. NH 3 does not dissociate on a flat Ir(111) surface, but surface defects and O ad facilitate NH 3 ad decomposition. High-energy resolution fast XPS measurements were used to monitor the surface coverage during reaction on Ir(110), and temperature-programmed reaction measurements...
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