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- W2045493054 abstract "We have undertaken a study of high work function (φ) surfaces as part of an ongoing project searching for efficient target materials for use in hyperthermal surface ionization (HSI), a new mass spectroscopy ionization technique. HSI relies on high φ surfaces for the production of positive ions. Rhenium is particularly interesting in this respect as oxidation substantially increases φ to approximately 7 eV. Using a novel ultrahigh vacuum scanning Kelvin probe and Auger electron spectroscopy we have followed the oxidation kinetics of clean, polycrystalline rhenium at temperatures in the range (300–800) K and examined the effects of oxidation via high resolution φ topographies. Our results indicate a Δφ increase of 1050 meV at 300 K rising to 1950 meV at 800 K. We observe two reaction stages in the 300 K data, with a transition at 150 L, characterized by different rates of oxide growth. Sputter-cleaned surfaces exhibit significant surface roughness even after annealing, which dramatically influences the second oxidation stage." @default.
- W2045493054 created "2016-06-24" @default.
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- W2045493054 date "2000-01-01" @default.
- W2045493054 modified "2023-10-11" @default.
- W2045493054 title "Work function study of rhenium oxidation using an ultra high vacuum scanning Kelvin probe" @default.
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- W2045493054 doi "https://doi.org/10.1063/1.1289486" @default.
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