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- W2078092593 abstract "The interaction of oxygen with a polycrystalline tungsten ribbon has been examined using electron stimulated desorption. At least three binding states of adsorbed oxygen have been identified: a physically adsorbed state which forms at 20° K, and two chemisorbed states designated β1 and β2. Both the physisorbed state and the β1-state liberate positive ions when bombarded by 100 eV electrons; no positive ions were observed on electron bombardment of the β2-state. The results indicate that the physisorbed state and the β1state are molecular. There is an enhanced adsorption of oxygen above 500° K which is primarily due to the creation of binding sites by thermal rearrangement of the oxygen covered surface. The maximum in the ion energy distribution is at 6.5 V for β1-oxygen and at 0.5 V for physisorbed oxygen. The total cross section Qβ1 for electronic desorption from the β1-state is 7 × 10−19 cm2 the ionic cross section Qβ1 + is = 3.4 × 10−20 cm2. The maximum ion yields g+ (ions/electron) are g+ = 1.5 × 10−6 for 300° K adsorption, g+ 3 = 3.3 × 10−6 for adsorption at 730° K, and g+ = 5 × 10−5 for adsorption at 20° K." @default.
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- W2078092593 date "1968-07-01" @default.
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- W2078092593 title "Desorption by electron impact: Oxygen adsorbed on tungsten" @default.
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- W2078092593 doi "https://doi.org/10.1016/0039-6028(68)90075-7" @default.
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