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Journal Articles

Structural analysis of Si(111)-$$sqrt{21}timessqrt{21}$$-(Ag,Au) surface by using reflection high-energy positron diffraction

Fukaya, Yuki; Kawasuso, Atsuo; Ichimiya, Ayahiko

Surface Science, 601(22), p.5187 - 5191, 2007/11

https://doi.org/10.1016/j.susc.2007.04.188
 Times Cited Count：12 Percentile：49.47(Chemistry, Physical)

no abstracts in English

Journal Articles

Surface structure of In/Si(111) studied by reflection high-energy positron diffraction

Hashimoto, Mie; Fukaya, Yuki; Kawasuso, Atsuo; Ichimiya, Ayahiko

Surface Science, 601(22), p.5192 - 5194, 2007/11

https://doi.org/10.1016/j.susc.2007.04.242
 Times Cited Count：6 Percentile：31.25(Chemistry, Physical)

no abstracts in English

Oral presentation

Role of steps in Cu$$_{2}$$O formation on Cu(410) using a hyperthermal O$$_{2}$$ molecular beam

Okada, Michio*; Vattuone, L.*; Moritani, Kosuke*; Gerbi, A.*; Savio, L.*; Yoshigoe, Akitaka; Teraoka, Yuden; Rocca, M.*; Kasai, Toshio*

no journal, , 

Herein we report the results of our detailed studies on the initial oxidation process, especially the Cu$$_{2}$$O formation, on Cu(410). From the high-resolution electron energy-loss spectroscopy (HREELS), the Cu$$_{2}$$O formation is verified at a high temperature for the thermal O$$_{2}$$ exposure. However, from the X-ray photoemission spectroscopy (XPS) measurements in conjunction with synchrotron radiation (SR), the efficiency of Cu$$_{2}$$O formation is quite low for the thermal O$$_{2}$$ exposure. On the other hand, it was found on Cu(410) that hyperthermal O$$_{2}$$ molecular beams (HOMB) at 2.2eV is an efficient tool for the fabrication of Cu$$_{2}$$O even at room temperature or at lower temperatures. The O-1s and valence-band XPS spectra clearly demonstrate the characteristic features of Cu$$_{2}$$O formation induced by HOMB. Furthermore, such Cu$$_{2}$$O formation depends strongly on the azimuthal direction of the incident HOMB, impinging dominantly on a terrace or on a step.

Oral presentation

Effect of the internal excited states of oxygen molecule in the dissociative adsorption processes on Cu surfaces

Moritani, Kosuke*; Teraoka, Yuden; Okada, Michio*; Yoshigoe, Akitaka; Kasai, Toshio*

no journal, , 

We have investigated the effect of the internally excited oxygen molecules in the oxygen dissociation processes on Cu(111), (110), (100) surfaces. All experiments were performed using the SUREAC2000, an experimental end-station installed at a soft X-ray synchrotron radiation (SR) beamline (BL23SU) in the SPring-8. The hyperthermal oxygen molecular beam (HOMB) was continuously generated by the adiabatic expansion of the O$$_{2}$$, He and Ar. After the irradiation of a proper amount of HOMB, SR-XPS spectra were measured at 300 K. We found that the initial sticking probabilities on the all copper surfaces were enhanced under the higher nozzle temperature of 1400 K. It is well known that the higher nozzle temperature can change the population of vibrationally excited O$$_{2}$$ molecules. It suggests that the vibrational degrees of freedom of O$$_{2}$$ molecules affect their reactivity as they hit the copper surfaces.

Oral presentation

Clarification of the mechanism of sulfur trioxide electrolysis

Suzuki, Chikashi; Nakagiri, Toshio

no journal, , 

no abstracts in English

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