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7 surface using high-resolution core-level photoelectron spectroscopyKakiuchi, Takuhiro*; Matoba, Tomoki*; Koyama, Daisuke*; Yamamoto, Yuki*; Kato, Daiki*; Yoshigoe, Akitaka
Surface Science, 701, p.121691_1 - 121691_8, 2020/11
Times Cited Count：2 Percentile：9.93(Chemistry, Physical)Ultrathin hafnium films on Si(111)-77 were studied using synchrotron radiation photoelectron spectroscopies to reveal the chemical states at interface and surface. Ultrathin Hf layers grow on clean Si(111)-77 surface by lever rule. Surface and interface of Hf/Si(111) contain three components (metallic Hf layers, Hf monosilicide (HfSi) and Si-rich Hf silicide). Ultrathin Hf layers changes HfSi
islands on bared Si(111)-77 surface after annealing at 1073 K. It was found that the long axes of the rectangle islands expand the direction connecting the corner holes in DAS model of clean Si(111)-77 surface.
7 surface at 300 K; Comparison of thermal equilibrium gas and supersonic molecular beams for oxygen adsorptionYoshigoe, Akitaka; Teraoka, Yuden
Journal of Physical Chemistry C, 118(18), p.9436 - 9442, 2014/05
Times Cited Count：13 Percentile：38.60(Chemistry, Physical)Translational energy of gas molecules is a fundamental physical quantity in gas-solid reactions. Understanding adsorption process of thermal gas in terms of translational energy remains an unsolved issue. Here, for thermal-O and supersonic O molecular beams, we present a comparative study of oxide evolution at a Si(111)-77 surface at room temperature. Real-time observations of oxides were conducted by employing synchrotron radiation photoelectron spectroscopy. It was found that ins structure is the common first product for oxidation by thermal-O and supersonic O molecular beams. Similarities between them for oxide evolution were found and illustrate the notion that translational energy of thermal O can be ascribed to the average molecular kinetic energy defined based on the most probable speed of the Maxwell-Boltzmann distribution. This experimental result suggests that translational energy is the unifying reaction parameter that rationalizes adsorption mechanisms.
7) surfaceHayashi, Kazuhiko; Kawasuso, Atsuo; Ichimiya, Ayahiko
Surface Science, 600(19), p.4426 - 4429, 2006/10
Times Cited Count：5 Percentile：26.33(Chemistry, Physical)no abstracts in English
-Ag surface studied by reflection high-energy positron diffractionFukaya, Yuki; Kawasuso, Atsuo; Ichimiya, Ayahiko
e-Journal of Surface Science and Nanotechnology (Internet), 3, p.228 - 232, 2005/07
no abstracts in English
-Ag surface at room temperature by reflection high-energy positron diffractionFukaya, Yuki; Kawasuso, Atsuo; Hayashi, Kazuhiko; Ichimiya, Ayahiko
Applied Surface Science, 244(1-4), p.166 - 169, 2005/05
Times Cited Count：5 Percentile：25.30(Chemistry, Physical)no abstracts in English
Fukuda, Yuji; Akahane, Yutaka; Aoyama, Makoto; Inoue, Norihiro*; Ueda, Hideki; Nakai, Yoshiki*; Tsuji, Koichi*; Yamakawa, Koichi; Hironaka, Yoichiro*; Kishimura, Hiroaki*; et al.
Applied Physics Letters, 85(21), p.5099 - 5101, 2004/11
Times Cited Count：11 Percentile：42.19(Physics, Applied)We have demonstrated diffraction from Si(111) crystal using X-rays from highly ionized Ar ions produced by laser irradiation with an intensity of 610
W/cm
and a pulse duration of 30 fs acting upon micron-sized Ar clusters. The measured total photon flux and line width in the He
line (3.14 keV) were 410
photons/shot/4
sr and 3.7 eV (FWHM), respectively, which is sufficient to utilize as a debris-free light source for time-resolved X-ray diffraction studies.
Kawasuso, Atsuo; Ishimoto, Takayuki*; Maekawa, Masaki; Fukaya, Yuki; Hayashi, Kazuhiko; Ichimiya, Ayahiko
Review of Scientific Instruments, 75(11), p.4585 - 4588, 2004/11
Times Cited Count：33 Percentile：79.78(Instruments & Instrumentation)A 10 keV positron beam has been developed using coaxially symmetric electromagnetic lenses for reflection high-energy positron diffraction (RHEPD) experiments. The beam brightness is 
10 e
/sec/cm/rad/V which is comparable to that obtained using brightness enhancement technique. The beam parallel and normal coherence lengths are over 100 
and 40 , respectively, which are long enough to observe diffraction patterns associated with large surface super-structures. RHEPD patterns from a Si(111)-(77) reconstructed surface have been successfully observed with a much better quality than previously reported.
7 surfacesHayashi, Kazuhiko; Fukaya, Yuki; Kawasuso, Atsuo; Ichimiya, Ayahiko
Applied Surface Science, 237(1-4), p.34 - 39, 2004/10
no abstracts in English
7 surface probed by reflection high-energy positron diffractionKawasuso, Atsuo; Fukaya, Yuki; Hayashi, Kazuhiko; Maekawa, Masaki; Okada, Sohei; Ichimiya, Ayahiko
Physical Review B, 68(24), p.241313_1 - 241313_4, 2003/12
Times Cited Count：25 Percentile：72.06(Materials Science, Multidisciplinary)We report the first observation of reflection high-energy positron diffraction from a 
reconstructed Si(111) surface with an well-collimated 20 kV positron beam. The diffraction pattern clearly exhibited the 1/7-th to 3/7-th order Laue zones in addition to the zero-th and first Laue zones. From the dynamical calculation of the rocking curve in the total reflection region, the vertical position of adatom layer was determined to be 1.52 relative to the stacking fault layer. This value is greater than that predicted in the first principles study suggesting a significant outward relaxation of adatoms.
Kawasuso, Atsuo; Yoshikawa, Masahito; Kojima, Kazutoshi; Okada, Sohei; Ichimiya, Ayahiko*
Physical Review B, 61(3), p.2102 - 2106, 2000/01
Times Cited Count：13 Percentile：56.98(Materials Science, Multidisciplinary)no abstracts in English
Tang, J.*; Ogawa, Shuichi*; Yoshigoe, Akitaka; Nishimoto, Kiwamu*; Ishizuka, Shinji*; Teraoka, Yuden; Takakuwa, Yuji*
no journal, ,
7 studied by real-time photoelectron spectroscopy and theoretical calculationsTang, J.*; Nishimoto, Kiwamu*; Ogawa, Shuichi*; Yoshigoe, Akitaka; Ishizuka, Shinji*; Teraoka, Yuden; Takakuwa, Yuji*
no journal, ,
