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We investigated Si2p spectra for the Si(100)c(4x2) surfaces exposed to CO and CO 2 to clarify how the adsorbed molecules affect the clean surface spectra in ultra-high vacuum (UHV). After a small amount of CO exposure (0.05 L), the spectral shape looks sharper as compared with that of the clean surface due to the reduced intensity of the down dimer peak, because CO is preferentially adsorbed...
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