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Journal Articles

Structural analysis of Ge(111)-3$$times$$3-Sn surface at low-temperature by reflection high-energy positron diffraction

Fukaya, Yuki; Kawasuso, Atsuo; Ichimiya, Ayahiko

Surface Science, 600(18), p.4086 - 4088, 2006/09

https://doi.org/10.1016/j.susc.2005.11.069
 Times Cited Count：11 Percentile：47.16(Chemistry, Physical)

no abstracts in English

Journal Articles

Comparative study of oxidation on Cu and Cu$$_{3}$$Au surfaces with a hyperthermal O$$_{2}$$ molecular beam

Okada, Michio*; Moritani, Kosuke; Fukuyama, Tetsuya*; Mizutani, Hironori*; Yoshigoe, Akitaka; Teraoka, Yuden; Kasai, Toshio*

Surface Science, 600(18), p.4228 - 4232, 2006/09

https://doi.org/10.1016/j.susc.2006.01.149
 Times Cited Count：20 Percentile：64.39(Chemistry, Physical)

Dissociative adsorption of hyperthermal O$$_{2}$$ molecules on Cu$$_{3}$$Au(100) was investigated by X-ray photoemission spectroscopy in conjunction with a synchrotron light source. Comparing the O-uptake curve on Cu$$_{3}$$Au with that on Cu, it was found that the dissociative adsorption of O$$_{2}$$ is more activated (less reactive) due to Au alloying. The low-energy electron-diffraction (LEED) pattern of c(2$$times$$2) for the clean surface turned into the (1$$times$$1) LEED pattern during the oxidation by hyperthermal O$$_{2}$$ molecular beam, suggesting that the O adsorption induces the Cu-atom segregation on the surface.

Journal Articles

Structure of GaAs(001)-c(4$$times$$4); Comparison of X-ray diffraction and first-principles calculation

Takahashi, Masamitsu; Kratzer, P.*; Penev, E.*; Mizuki, Junichiro

Surface Science, 600(18), p.4099 - 4102, 2006/09

https://doi.org/10.1016/j.susc.2006.01.127
 Times Cited Count：1 Percentile：6.63(Chemistry, Physical)

The GaAs(001)-c(4$$times$$4) has been studied by synchrotron surface X-ray diffraction. The atomic coordinates and Debye-Waller factors were determined up to the sixth layer from the surface. The results support the formation of the Ga-As heterodimers. The resultant atomic coordinates were compared with those given by a first-principle calculation. In spite of the theoretical prediction of the stability of the single-heterodimer structure, our data fit best a three-heterodimer model where three heterodimers are present in one unit cell. The preference of the formation of the three heterodimers will be discussed in the relationship with the transition process from the 2$$times$$4 to the c(4$$times$$4) structures.

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