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- W2034260521 abstract "Abstract Clean Si(0 0 1)-2×1 surface with a double-domain dimer structure was oxidized at room temperature (RT) under O2 pressure of 1×10−8 Torr. The oxidation is almost saturated at O2-exposure of 10 L (1 L: 10 −6 Torr s) with O2 coverage of 1.30±0.05 ML (1 ML: 6.78×1014 atoms/cm2), which was measured by medium energy ion scattering. There exist two oxidation stages, rapid (0–10 L) and very slow (⩾10 L) oxidation regimes. In the slow oxidation regime, the O-adsorption rate was estimated to be 0.5–1.0×10−4 ML/L and the O atoms are adsorbed to on-top sites. The Si-2p core level analysis using synchrotron-radiation light revealed the fact that the high oxidation states Si3+ and Si4+ appear and have large fractions even at the early stage of the oxidation. As another information, the Si4+ state atoms tend to take the position of the top surface and other oxidation states atoms are distributed in the top and second layers. The present results indicate that the initial oxidation does not proceed in a laterally uniform fashion but occurs as the formation of microscopic oxide complexes distributed randomly. Considering the absolute O coverage and the fractions of oxidation states, we propose a possible structure model for the initial oxidation of the Si(0 0 1)-2×1 surface at RT." @default.
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- W2034260521 date "2001-08-01" @default.
- W2034260521 modified "2023-09-25" @default.
- W2034260521 title "Initial oxidation of Si(001)-2×1 surface studied by photoelectron spectroscopy coupled with medium energy ion scattering" @default.
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- W2034260521 doi "https://doi.org/10.1016/s0039-6028(01)01165-7" @default.
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