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Journal Articles

Atomic structure of two-dimensional binary surface alloys; Si(111)-$$sqrt{21}timessqrt{21}$$ superstructure

Fukaya, Yuki; Matsuda, Iwao*; Hashimoto, Mie*; Kubo, Keisuke*; Hirahara, Toru*; Yamazaki, Shiro*; Choi, W. H.*; Yeom, H. W.*; Hasegawa, Shuji*; Kawasuso, Atsuo; et al.

Surface Science, 606(11-12), p.919 - 923, 2012/06

 Times Cited Count:6 Percentile:30.15(Chemistry, Physical)

no abstracts in English

Journal Articles

Electron compound nature in a surface atomic layer of a two-dimensional hexagonal lattice

Matsuda, Iwao*; Nakamura, Fumitaka*; Kubo, Keisuke*; Hirahara, Toru*; Yamazaki, Shiro*; Choi, W. H.*; Yeom, H. W.*; Narita, Hisashi*; Fukaya, Yuki; Hashimoto, Mie*; et al.

Physical Review B, 82(16), p.165330_1 - 165330_6, 2010/10

 Times Cited Count:9 Percentile:42.3(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Structure and phase transition of low-dimensional metals on Si(111) surfaces studied by reflection high-energy positron diffraction

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

Journal of Physics; Conference Series, 225, p.012008_1 - 012008_8, 2010/06

 Times Cited Count:1 Percentile:51.98

no abstracts in English

Journal Articles

Phase transition of In/Si(111) surface studied by reflection high-energy positron diffraction

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

e-Journal of Surface Science and Nanotechnology (Internet), 7, p.436 - 440, 2009/04

no abstracts in English

Journal Articles

Metal co-adsorption induced $$sqrt{21}timessqrt{21}$$ superstructure on Si(111) surface studied by reflection high-energy positron diffraction

Fukaya, Yuki; Matsuda, Iwao*; Hashimoto, Mie; Narita, Hisashi*; Kawasuso, Atsuo; Ichimiya, Ayahiko

e-Journal of Surface Science and Nanotechnology (Internet), 7, p.432 - 435, 2009/04

no abstracts in English

Journal Articles

Positron energy loss spectroscopy in reflection high-energy positron diffraction

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

JAEA-Review 2008-055, JAEA Takasaki Annual Report 2007, P. 154, 2008/11

no abstracts in English

Journal Articles

Atomic scale study of surface structures and phase transitions with reflection high-energy positron diffraction

Kawasuso, Atsuo; Fukaya, Yuki; Hashimoto, Mie; Ichimiya, Ayahiko; Narita, Hisashi*; Matsuda, Iwao*

Materials Science Forum, 607, p.94 - 98, 2008/11

Currently, we are performing the surface study with reflection high-energy positron diffraction (RHEPD). The advantage of this method is the appearance of total reflection of positrons at the first surface layer. In this talk, we will present the recent progress of our research on some unknown surface structures and phase transition mechanisms.

Journal Articles

Quasi-one-dimensional In atomic chains on Si(111) at low temperature studied by reflection high-energy positron diffraction and scanning tunneling microscopy

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

Applied Surface Science, 254(23), p.7733 - 7736, 2008/09

 Times Cited Count:3 Percentile:17.79(Chemistry, Physical)

no abstracts in English

Journal Articles

Surface structure and phase transition of Ge(111)-3$$times$$3-Pb studied by reflection high-energy positron diffraction

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

Applied Surface Science, 254(23), p.7827 - 7830, 2008/09

 Times Cited Count:3 Percentile:17.79(Chemistry, Physical)

no abstracts in English

Journal Articles

Surface structure of Si(111)-(8$$times$$2)-In determined by reflection high-energy positron diffraction

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

Surface Science, 602(14), p.2448 - 2452, 2008/07

 Times Cited Count:18 Percentile:61.47(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

 Times Cited Count:4 Percentile:23.57(Chemistry, Physical)

no abstracts in English

Journal Articles

Reflection high-energy positron diffraction study of surface super-structures

Kawasuso, Atsuo; Fukaya, Yuki*; Hayashi, Kazuhiko; Hashimoto, Mie; Ichimiya, Ayahiko

Physica Status Solidi (C), 4(10), p.3924 - 3927, 2007/09

Well-focused and highly parallel positron beam is totally reflected at the first surface layer when grazing incidence at a small enough angles. Therefore, the reflection high-energy positron diffraction (RHEPD) is suited to determine the surface structures without any disturbance from the bulk. Using the electro-magnetic lenses we developed a positron beam which has more coherence than before. We found that the RHEPD pattern from the Si-7$$times$$7 surface is considerably different from that of electron diffraction. The difference is reasonably explained as a strong thermal diffuse scattering of positrons. As a further application, we studied the phase transition of Si-Ag ultra-thin film. We found that the surface-sensitive diffraction spots exhibit significant temperature dependences. Based on the dynamical diffraction theory, the temperature dependences are reproduced considering the order-disorder phase transition. This will terminate the long debates in the surface science community. Furthermore, we recently found that the positron-surface interaction is different from the electron-surface interaction, especially in the elastic processes. We present the above recent advances of surface studies using RHEPD.

Journal Articles

Reflection high-energy positron diffraction study of surface super-structures

Kawasuso, Atsuo; Fukaya, Yuki; Hayashi, Kazuhiko*; Hashimoto, Mie; Ichimiya, Ayahiko

Physica Status Solidi (C), 4(10), p.3924 - 3927, 2007/09

 Times Cited Count:0 Percentile:0.07

In this study, we performed the positron energy loss spectroscopy measurements from several surfaces using energy-filtered reflection high-energy positron diffraction. For Si(111)-7$$times$$7 surface, we observed at least five distinct loss peaks. The interval of energy loss peaks is approximately 10 eV, which corresponds to the surface plasmon loss energy of silicon. The positron energy loss spectra are well-approximated by the Poisson distribution. The average excitation number of surface plasmon is 2.6 under the total reflection condition. This number is similar to what expected for electrons at zero glancing angle. Thus, positrons lose their energy due to surface plasmon excitation much more sufficiently than electrons. We found that the specular spot is broadened in the total reflection region especially at the tail part due to plasmon excitation.

Journal Articles

${it Trans}$-1,2-dichloroethylene decomposition in low-humidity air under electron beam irradiation

Sun, Y.*; Hakoda, Teruyuki; Chmielewski, A. G.*; Hashimoto, Shoji*

Radiation Physics and Chemistry, 68(5), p.843 - 850, 2003/12

 Times Cited Count:7 Percentile:46.97(Chemistry, Physical)

no abstracts in English

Journal Articles

Mechanism of 1,1-dichloroethylene decomposition in humid air under electron beam irradiation

Sun, Y.*; Hakoda, Teruyuki; Chmielewski, A. G.*; Hashimoto, Shoji; Zimek, Z.*; Bulka, S.*; Ostapczuk, A.*; Nichipor, H.*

Radiation Physics and Chemistry, 62(4), p.353 - 360, 2001/10

 Times Cited Count:21 Percentile:81.02(Chemistry, Physical)

no abstracts in English

Journal Articles

Decomposition of 1,1-dichloroethylene in humid air under electron beam irradiation

Sun, Y.*; Hakoda, Teruyuki; Chmielewski, A. G.*; Hashimoto, Shoji; Zimek, Z.*; Bulka, S.*; Ostapczuk, A.*; Nichipor, H.*

Proceedings of 5th International Symposium & Exhibition on Environmental Contamination in Central & Eastern Europe (CD-ROM), 6 Pages, 2000/00

no abstracts in English

Oral presentation

3$$times$$3-$$sqrt{3}timessqrt{3}$$ phase transition of Sn/Ge(111) surface studied by reflection high-energy positron diffraction

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

no journal, , 

no abstracts in English

Oral presentation

Structure analysis of In/Si(111) surface studied by reflection high-energy positron diffraction

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

no journal, , 

no abstracts in English

Oral presentation

Phase transition of Si(111)-$$sqrt{3}timessqrt{3}$$-Ag surface studied by reflection high-energy positron diffraction, 2

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

no journal, , 

no abstracts in English

Oral presentation

Metal adsorption induced superstructure on Si(111)-$$sqrt{3}timessqrt{3}$$-Ag surface studied by reflection high-energy positron diffraction

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

no journal, , 

no abstracts in English

50 (Records 1-20 displayed on this page)