Abstract
The authors report the positive and negative ion time-of-flight secondary ion mass spectrometry spectra obtained with Bi32+ primary ions at 50 keV of an Fe film annealed in hydrogen at 750 °C to form Fe nanoparticles. This surface had been exposed to the air; it had previously been shown by x-ray photoemission spectroscopy to be entirely oxidized. The strongest signal in the positive ion spectrum corresponded to Fe+, with FexOyHz+ species also present. A substantial Al+ signal was observed due to exposure of the underlying alumina substrate. The negative ion spectrum showed O−, OH−, and AlO−.
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