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Journal Articles

Characterization of liquid targets in Vacuum condition

Yamamoto, Kazami; Ogiwara, Norio*; Kuramochi, Masaya*

e-Journal of Surface Science and Nanotechnology (Internet), 21(4), p.359 - 364, 2023/07

In recent years, durable target is required according to increase of the beam power. To solve this problem, a liquid film was formed in vacuum and tested it as a target. An ethanol and a mercury were selected as liquid target materials, and we investigated whether the liquid sheet could be formed stably in a vacuum and how about the vacuum pressure. As a result, it was confirmed that the liquid films were stably formed in both case and the pressures with the films were about the vapor pressure of the materials.

Journal Articles

Evaluation of vacuum firing effect on stainless steel from vacuum and surface point of view

Kamiya, Junichiro; Takano, Kazuhiro*; Wada, Kaoru; Yanagibashi, Toru*

e-Journal of Surface Science and Nanotechnology (Internet), 21(3), p.144 - 153, 2023/06

no abstracts in English

Journal Articles

Investigation of niobium surface roughness and hydrogen content with different polishing conditions for performance recovery of superconducting QWRs in JAEA Tokai-Tandem Accelerator

Kamiya, Junichiro; Nii, Keisuke*; Kabumoto, Hiroshi; Kondo, Yasuhiro; Tamura, Jun; Harada, Hiroyuki; Matsui, Yutaka; Matsuda, Makoto; Moriya, Katsuhiro; Ida, Yoshiaki*; et al.

e-Journal of Surface Science and Nanotechnology (Internet), 21(4), p.344 - 349, 2023/05

no abstracts in English

Journal Articles

Observation of chemisorbed O$$_2$$ molecule at SiO$$_2$$/Si(001) interface during Si dry oxidation

Tsuda, Yasutaka; Yoshigoe, Akitaka; Ogawa, Shuichi*; Sakamoto, Tetsuya*; Takakuwa, Yuji*

e-Journal of Surface Science and Nanotechnology (Internet), 21(1), p.30 - 39, 2022/11

Journal Articles

Annealing effect of absorbing property for Cs and CsI in fullerene investigated by synchrotron X-ray photoelectron spectroscopy

Sekiguchi, Tetsuhiro; Yokoyama, Keiichi; Yaita, Tsuyoshi

e-Journal of Surface Science and Nanotechnology (Internet), 20(3), p.186 - 195, 2022/07

Cesium-135 having long life, 2.3 million y, that is contained in nuclear wastes may cause long-term pollution. Technology of isotopic separation of such long lived nuclide is indispensable not only for its volume reduction but also annihilation by nuclear transmutation. The recovery of atomic Cs from molecular CsI is mandatory. We have investigated fullerene C$$_{60}$$ as a potential absorber for Cs. Angle-resolved X-ray photoelectron spectroscopy, AR-XPS has been used to analyze the depth concentration distribution of Cs. Experiments were performed at soft X-ray beamline BL27A at KEK PF facility. We report on the annealing effect after deposition of Cs and the effect of heating substrate during deposition. For Cs/C$$_{60}$$ sample, the intensity ratio of Cs-3d/C-1s increased in double at the high temperature. This suggests that Cs atoms remain in the material at high temperatures. On the other hand, for CsI/C$$_{60}$$, the intensity ratio does not change much by elevating temperatures.

Journal Articles

Development of ultraslow, monochromatic, and mass-selected ion source toward measurement of hydrogen ion permeability of graphene

Terasawa, Tomoo; Fukutani, Katsuyuki; Yasuda, Satoshi; Asaoka, Hidehito

e-Journal of Surface Science and Nanotechnology (Internet), 20(4), p.196 - 201, 2022/07

Graphene is a perfect impermeable membrane for gases but permeable to hydrogen ions. Hydrogen ion permeation shows the isotope effect, i.e., deuteron is slower than proton when permeating graphene. However, the permeation mechanism and the origin of the isotope effect are still unclear. Here, we propose a strategy to discuss the hydrogen ion permeation mechanism of graphene by developing an ion source with ultraslow, monochromatic, and mass-selected hydrogen ion beam. We employed a hemispherical monochromator and a Wien filter for the ion source to achieve the energy and mass resolutions of 0.39 eV and 1 atomic mass unit, respectively. The energetically sharp ion beam is expected to allow us to directly measure the permeability of graphene with high accuracy.

Journal Articles

Hydrogen-Ti$$^{3+}$$ complex as a possible origin of localized electron behavior in hydrogen-irradiated SrTiO$$_3$$

Ito, Takashi

e-Journal of Surface Science and Nanotechnology (Internet), 20(3), p.128 - 134, 2022/05

Journal Articles

Evaluation of titanium vacuum chamber as getter pump

Kamiya, Junichiro; Takano, Kazuhiro*; Yuza, Hiromu*; Wada, Kaoru

e-Journal of Surface Science and Nanotechnology (Internet), 20(2), p.107 - 118, 2022/05

no abstracts in English

Journal Articles

STM-induced SiO$$_{2}$$ decomposition on Si(110)

Yano, Masahiro; Uozumi, Yuki*; Yasuda, Satoshi; Asaoka, Hidehito; Tsukada, Chie*; Yoshida, Hikaru*; Yoshigoe, Akitaka

e-Journal of Surface Science and Nanotechnology (Internet), 16, p.370 - 374, 2018/08

Journal Articles

Structure analysis of two-dimensional atomic sheets by total-reflection high-energy positron diffraction

Fukaya, Yuki

e-Journal of Surface Science and Nanotechnology (Internet), 16, p.111 - 114, 2018/04

no abstracts in English

Journal Articles

Ion desorption from bulk cesium chloride at moderate temperature ($$<$$500$$^{circ}$$C) under electric field

Baba, Yuji; Shimoyama, Iwao

e-Journal of Surface Science and Nanotechnology (Internet), 16, p.53 - 59, 2018/03

Surface ionization for cesium chloride and Cs-adsorbed soil has been investigated. For cesium chloride, neutral cesium was desorbed around 645$$^{circ}$$C which is close to the melting point of cesium. While Cs$$^{+}$$ ion was desorbed from 400$$^{circ}$$C. The ratio of desorbed ions and neutrals (Cs$$^{+}$$/Cs$$^{0}$$) has a maximum around 410 $$^{circ}$$C. Temperature dependence of Cs$$^{+}$$/Cs$$^{0}$$ was analyzed using Saha-Langmuir equation, As a result, it was found that the temperature maximum is due to the changes of the surface work function induced by the phase transition of CsCl.

Journal Articles

Development of fluorescence XAFS system in soft X-ray region toward operando conditions using polycapillary X-ray lens

Honda, Mitsunori; Shimoyama, Iwao; Baba, Yuji; Suzuki, Shinichi; Okamoto, Yoshihiro; Yaita, Tsuyoshi

e-Journal of Surface Science and Nanotechnology (Internet), 14, p.35 - 38, 2016/02

Journal Articles

Precise observation of growth of surface oxide layer for Pd and Cu nanoparticles during oxidative/reductive gases cyclic flow studied by real-time-resolved XAFS spectroscopy

Matsumura, Daiju; Nishihata, Yasuo; Okajima, Yuka*

e-Journal of Surface Science and Nanotechnology (Internet), 14, p.48 - 52, 2016/00

Journal Articles

Interaction between ultra-trace amount of cesium and oxides studied by total-reflection X-ray photoelectron spectroscopy

Baba, Yuji; Shimoyama, Iwao; Hirao, Norie; Izumi, Toshinori

e-Journal of Surface Science and Nanotechnology (Internet), 13, p.417 - 421, 2015/09

 Times Cited Count:1

The interaction between alkali metals and oxides has attracted much attention as heterogeneous catalysis, chemical reaction promoters, and high intensity electron emitter. Also the interaction of cesium and oxides has become important subject, because radioactive cesium trapped in minerals such as clay and soil may cause health risks. In the present study, we analyzed chemical states of ultra-trace amount of cesium on oxide surfaces by total reflection X-ray photoelectron spectroscopy (TR-XPS) exited by synchrotron radiation. For the adsorbed cesium thicker than 0.01 layer, cesium is weakly bound with oxide through Van-der-Waals force. On the other hand, for ultra-thin layer about 0.002 layer, the chemical bond changes to covalent bond. It is suggested that this change in the chemical bonding state is one of the reasons why radioactive cesium is hard to be released from minerals.

Journal Articles

Crystal structure and electron density distribution analyses of Nd$$_{x}$$Ce$$_{1-x}$$O$$_{2-delta}$$ for electrolyte by Rietveld/ maximum entropy method

Taguchi, Tomitsugu; Igawa, Naoki; Birumachi, Atsushi; Asaoka, Hidehito; Miwa, Shuhei; Osaka, Masahiko

e-Journal of Surface Science and Nanotechnology (Internet), 13, p.339 - 342, 2015/06

Rare-earth doped ceria exhibits both ionic and electronic conductions, and those ceria with higher ratio of ionic conduction against electronic conduction is used as a solid electrolyte for solid oxide fuel cells. The electron density distributions in crystals are closely related to the electron diffusing pathway which affects the electronic conduction. In this study, we investigated the electron density distribution of doped ceria as a function of the content of Nd$$_{2}$$O$$_{3}$$-dopant to deduce the ratio of the electronic to ionic conduction. The crystal structure was refined with the space group, ${it Fm}$-3${it m}$, which is the same as undoped ceria. Ce and Nd ions randomly occupied the 4${it a}$ site and O ion the 8${it c}$ site. The electron conduction pathway was distributed through the 4${it a}$-8${it c}$ and 8${it c}$-8${it c}$ sites. The relationship between crystal structural change and electron density distribution as a function of the content of Nd$$_{2}$$O$$_{3}$$ dopant will be discussed.

Journal Articles

Nuclear and electron density distributions of LiMn$$_{2}$$O$$_{4}$$ analyzed by combination of Rietveld/ maximum entropy method

Igawa, Naoki; Kodama, Katsuaki; Birumachi, Atsushi; Taguchi, Tomitsugu

e-Journal of Surface Science and Nanotechnology (Internet), 13, p.247 - 252, 2015/05

The nuclear and electron density distributions of LiMn$$_{2}$$O$$_{4}$$ which is one of the primitive cathode materials for secondary Li-ion batteries, were analyzed by applying Rietveld refinement and MEM to neutron and X-ray diffraction data, to estimate the Li diffusing pathway. The crystal structure of LiMn$$_{2}$$O$$_{4}$$ could be refined with the space group, ${it Fd}$-3${it m}$ in the temperature range from 240 to 573 K. The structure was transformed to ${it Fddd}$ below 240 K. The isotropic thermal displacement parameter of Li was proportional to the temperature excluding 240 to 300 K. According to the MEM analyses it was indicated that the Li ions diffuse through 8${it b}$ and 16${it e}$ around 300 K.

Journal Articles

Labeling co-sensitizer dye for XPS quantification in coadsorption dye-sensitized solar cells

Honda, Mitsunori; Yanagida, Masatoshi*; Han, L.*; Miyano, Kenjiro*

e-Journal of Surface Science and Nanotechnology (Internet), 12, p.63 - 67, 2014/02

Journal Articles

SiO desorption kinetics of Si(111) surface oxidation studied by real-time photoelectron spectroscopy

Tang, J.*; Nishimoto, Kiwamu*; Ogawa, Shuichi*; Yoshigoe, Akitaka; Ishizuka, Shinji*; Watanabe, Daiki*; Teraoka, Yuden; Takakuwa, Yuji*

e-Journal of Surface Science and Nanotechnology (Internet), 11, p.116 - 121, 2013/11

Journal Articles

One-dimentional nanotemplate structure of a Si(110) substrate

Yokoyama, Yuta; Asaoka, Hidehito; Sinsarp, A.*; Sasaki, Masahiro*

e-Journal of Surface Science and Nanotechnology (Internet), 10, p.509 - 512, 2012/09

The Si(110) surface has a quite unique one-dimensional (1-D) structure with 16$$times$$2 reconstruction. Since the perfectly straight rows extend over micrometers, the 16$$times$$2 structure can be a superior template for 1-D nanostructures. In this study, we tried to control the clustering of Ge atoms on the Si(110) - 16$$times$$2 substrate. When Ge is deposited at 523 K, clustering of Ge atoms is found. The size of the cluster was 1$$sim$$2 nm and many of them were located in a step edges. This trend is previously reported by vicinal Si(111) surface. With increasing temperature, the sizes of Ge clusters became larger. These results indicated that the size and alignment of the Ge cluster can be well controlled on the Si(110) - 16$$times$$2 template surface.

Journal Articles

Atomic and electronic structures of Si(111)-$$sqrt{21}timessqrt{21}$$ superstructure

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

e-Journal of Surface Science and Nanotechnology (Internet), 10, p.310 - 314, 2012/07

no abstracts in English

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