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• W1978403698 abstract "We have recorded photoelectron spectra of oxygen (1s) and nickel (2p32) and measured work functions of a Ni(100) surface as they depend on exposure to oxygen from 1 to > 500 × 10−6 Torr sec. O(1s) intensity as a function of exposure shows a fast chemisorption at low coverage, a region of slow oxygen adsorption in the 14 monolayer region [p(2 × 2) LEED periodicity] followed by an increasing rate of adsorption, and finally saturation. Sticking coefficients estimated from these data vary with coverage by more than an order of magnitude. Two adsorbed states of oxygen are apparent in the O(1s) spectra; a low coverage state with EbF = 531.6 eV and a high coverage state at EbF = 530.0 eV, but the Ni (2p32) spectrum does not reflect the presence of adsorbed oxygen until the coverage exceeds one monolayer. Comparison of the vacuum referenced binding energy in the condensed state (EbV = EbΓ + φ) to Evb for gas phase atomic oxygen shows that Evb[O(1s)] is reduced by 6.3–10.2 eV on adsorption. This change in measured binding energy is due in part to extra atomic relaxation (polarization) and in part to electron transfer to oxygen, both of which lower the binding energy. The shift of O(1s) binding energy at low oxygen coverage compared to that at saturation, however, appears to reflect increased charge transfer at saturation." @default.
• W1978403698 created "2016-06-24" @default.
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• W1978403698 date "1976-07-01" @default.
• W1978403698 modified "2023-09-25" @default.
• W1978403698 title "X-ray photoelectron spectroscopy of oxygen adsorption on clean Ni(100) surfaces" @default.
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• W1978403698 doi "https://doi.org/10.1016/0039-6028(76)90162-x" @default.
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