Auger−electron spectroscopy of high−temperature oxygen−rhenium interactions by AES

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Abstract
Oxygen coverage ϑ has been measured on a rhenium ribbon, in a wide temperature range (300−2200 K), with a CMA, while monitoring the oxygen pressure (10−9−10−6 Torr) and the rhenium trioxide formation with a quadrupolemass spectrometer. Under 5% coverage, ϑ vs p curves are linear, in agreement with an atomization reaction as the main process. Isotherm plots lead to a rhenium−oxygen atomic binding energy of 125 kcal/g atom at low coverage, while the trioxide flux indicates at higher coverage a surface reaction process, with a rate proportional to ϑ3 and a linear decrease of the atomic binding energy, χ = (125 − 25 ϑ) kcal/atom. The results are in close agreement with those previously obtained, according to a general interaction model of oxygen with transition metals.

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