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Report No.

Oxidation state during growth of very thin oxide on Ti(0001) surface

Takakuwa, Yuji*; Ishizuka, Shinji*; Yoshigoe, Akitaka ; Teraoka, Yuden; Moritani, Kosuke; Ogawa, Shuichi*; Mizuno, Yoshiyuki*; Tonda, Hideki*; Homma, Teiichi*

The oxidation reaction of Ti(0001) surface by oxygen molecules was observed by real-time in-situ photoemission spectroscopy using synchrotron radiation in the conditions of 400$$^{circ}$$C and 3.7$$times$$10$$^{-6}$$ Pa. The uptake curve of oxygen showed a plateau at the dose of 45-85 L and then increased again. This re-growth of oxide film was attributed to the drastic change of Ti oxidation state from TiO to TiO$$_{2}$$. Consequently, the characteristic change of the uptake curve was caused by the oxidation state change of Ti atoms.



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