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Journal Articles

Lattice dynamics in FeSe via inelastic X-ray scattering and first-principles calculations

Murai, Naoki; Fukuda, Tatsuo; Nakajima, Masamichi*; Kawamura, Mitsuaki*; Ishikawa, Daisuke*; Tajima, Setsuko*; Baron, A. Q. R.*

Physical Review B, 101(3), p.035126_1 - 035126_6, 2020/01

 Times Cited Count:1 Percentile:42.52(Materials Science, Multidisciplinary)

We report an inelastic X-ray scattering investigation of phonons in FeSe superconductor. Comparing the experimental phonon dispersion with density functional theory (DFT) calculations in the non-magnetic state, we found a significant disagreement between them. A better overall agreement was obtained by allowing for spin-polarization in DFT calculations, despite the absence of magnetic order in FeSe. This calculation gives a realistic approximation, at DFT level, of the disordered paramagnetic state of FeSe, in which strong spin fluctuations are present.

Journal Articles

Electrochemical adsorption on Pt nanoparticles in alkaline solution observed using in situ high energy resolution X-ray absorption spectroscopy

Kusano, Shogo*; Matsumura, Daiju; Ishii, Kenji*; Tanaka, Hirohisa*; Mizuki, Junichiro*

Nanomaterials (Internet), 9(4), p.642_1 - 642_14, 2019/04

 Times Cited Count:1 Percentile:84.04(Chemistry, Multidisciplinary)

Journal Articles

Effect of water for the oxygen adsorption on surface of PtCo catalysts

Cui, Y.-T.*; Harada, Yoshihisa*; Niwa, Hideharu*; Oshima, Masaharu*; Hatanaka, Tatsuya*; Nakamura, Naoki*; Ando, Masaki*; Yoshida, Toshihiko*; Ishii, Kenji*; Matsumura, Daiju

NanotechJapan Bulletin (Internet), 11(4), 6 Pages, 2018/08

no abstracts in English

Journal Articles

LES studies for predicting plume concentrations around nuclear facilities using an overlapping technique

Nakayama, Hiromasa; Takemi, Tetsuya*

Proceedings of 18th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes (HARMO-18) (USB Flash Drive), p.843 - 847, 2017/10

We have attempted to develop a practical and quick local-scale atmospheric dispersion calculation method using an overlapping technique for plume concentration distributions in an emergency response to nuclear accidents. In order to evaluate the overlapping approach, we performed LESs of turbulent flows and plume dispersion under varying mean wind directions using the meteorological data as the model input. When compared with the simulated results under the real meteorological condition, it is shown that the concentration distribution patterns are reasonably simulated by the overlapping method. It can be concluded that the atmospheric dispersion calculation method using the overlapping technique has potential performance for emergency responses to nuclear accidents.

Journal Articles

Solid parahydrogen and ESR

Kumada, Takayuki

Kagaku No Yoten Shirizu, 20, P. 71, 2017/06

no abstracts in English

Journal Articles

Wetting induced oxidation of Pt-based nano catalysts revealed by ${{it in situ}}$ high energy resolution X-ray absorption spectroscopy

Cui, Y.-T.*; Harada, Yoshihisa*; Niwa, Hideharu*; Hatanaka, Tatsuya*; Nakamura, Naoki*; Ando, Masaki*; Yoshida, Toshihiko*; Ishii, Kenji*; Matsumura, Daiju; Oji, Hiroshi*; et al.

Scientific Reports (Internet), 7(1), p.1482_1 - 1482_8, 2017/05

 Times Cited Count:8 Percentile:61.41(Multidisciplinary Sciences)

Journal Articles

Development of micro-structured fluorescent plates for high-resolution imaging

Sakai, Takuro; Yasuda, Ryo; Iikura, Hiroshi; Matsubayashi, Masahito

JPS Conference Proceedings (Internet), 11, p.020005_1 - 020005_6, 2016/11

Journal Articles

X-ray backscattering study of crystal lattice distortion in hidden order of URu$$_2$$Si$$_2$$

Tabata, Chihiro*; Inami, Toshiya; Michimura, Shinji*; Yokoyama, Makoto*; Hidaka, Hiroyuki*; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*

Philosophical Magazine, 94(32-33), p.3691 - 3701, 2014/00

 Times Cited Count:12 Percentile:37.3(Materials Science, Multidisciplinary)

Journal Articles

Vacuum ultraviolet spectrometer; Ray tracing

Koike, Masato; Sano, Kazuo*

Dai-5-Han Jikken Kagaku Koza 10; Busshitsu No Kozo 2, Bunko (Ge), 10, p.106 - 153, 2005/08

The chapter provides the basic knowledge of "vacuum ultraviolet spectrometers" and "ray racing" for young scientists without reading the numerous references and is intend to be the handbook for the specialist in various related sciences when they initiate spectroscopic experiments in the vacuum ultraviolet region. The content includes the basis of diffraction gratings, Optical properties of diffraction gratings, aberration theories, diffraction efficiency theories, basis of spectrometers, vacuum ultraviolet plane grating spectrometers, vacuum ultraviolet concave grating spectrometers, soft X-ray plane grating spectrometers, soft X-ray concave grating spectrometers, basis of ray tracing, applications of ray tracing, analytic design method, hybrid design method, etc.

Journal Articles

Application of diamond to fusion plasma diagnostic

Kusama, Yoshinori; Ishikawa, Masao

NEW DIAMOND, 21(3), p.24 - 25, 2005/07

no abstracts in English

Journal Articles

Signal processing system based on FPGAs for neutron imaging detectors using scintillators

Ebine, Masumi; Katagiri, Masaki; Birumachi, Atsushi; Matsubayashi, Masahito; Sakasai, Kaoru; Sato, Setsuo*

Nuclear Instruments and Methods in Physics Research A, 529(1-3), p.429 - 432, 2004/08

 Times Cited Count:1 Percentile:89.21(Instruments & Instrumentation)

no abstracts in English

Journal Articles

A Compact neutron detector using scintillators with wavelength shifting fibers by backside readout method

Katagiri, Masaki; Matsubayashi, Masahito; Sakasai, Kaoru; Nakamura, Tatsuya; Ebine, Masumi; Birumachi, Atsushi; Rhodes, N.*

Nuclear Instruments and Methods in Physics Research A, 529(1-3), p.313 - 316, 2004/08

 Times Cited Count:11 Percentile:38.16(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Design of a conical diffraction type plane holographic grating monochromator for use in the energy region of 1-4 keV

Koike, Masato; Namioka, Takeshi*

AIP Conference Proceedings 705, p.865 - 868, 2004/00

The high brightness soft X-ray sources have been playing an important role in frontier sciences and high technologies. Then it is often required to perform high-resolution spectroscopic measurements in the energy region of 1-10 keV by using a single instrument. Unfortunately, both the grating and the crystal spectrometer cannot meet the requirement satisfactorily, because of various problems they have in the efficiency, spectral resolution, and wavelength scanning range. To overcome these problems we have developed a conical diffraction type grating spectrometer for use in the 1-4 keV region. The spectrometer employs a toroidal mirror and a plane holographic grating to separate the imaging and dispersing functions. This spectrometer works both as monochromator and as spectrograph. In this paper, we describe details of the design and give the expected performance of the spectrometer for cases of practical interest in the use of soft X-ray synchrotron radiation and laboratory sources.

Journal Articles

High-counting-rate and high-position-resolution neutron imaging detectors using short-lifetime phosphors with crossed-fiber readout

Katagiri, Masaki; Sakasai, Kaoru; Matsubayashi, Masahito; Takahashi, Hiroyuki*; Nakazawa, Masaharu*

Nuclear Instruments and Methods in Physics Research A, 513(1-2), p.374 - 378, 2003/11

 Times Cited Count:3 Percentile:71.18(Instruments & Instrumentation)

no abstracts in English

Journal Articles

A New high energy-resolution soft-X-ray spectrometer for a transmission electron microscope

Terauchi, Masami*; Koike, Masato

Microscopy and Microanalysis, 9(S02), p.894 - 895, 2003/08

We have been developing a high energy-resolution soft-X-ray spectrometer for a transmission electron microscope to obtain the information of the density of states (DOS) of the valence band (occupied states) from identified small specimen areas. We have designed and produced a new grating. The new varied-line-spacing laminar-type holographic grating was designed to have a focal distance of about 50 cm. An energy resolution of about 0.7 eV is expected for X-ray energy of about 1000 eV.

Journal Articles

Performance of laminar-type holographic grating for a soft X-ray flat field spectrograph in the 0.7-6 nm region

Koike, Masato; Sano, Kazuo*; Gullikson, E. M.*; Harada, Yoshihisa*; Kumata, Hideki*

Review of Scientific Instruments, 74(2), p.1156 - 1158, 2003/02

 Times Cited Count:20 Percentile:29.39(Instruments & Instrumentation)

Laminar-type holographic grating having a groove density of 2400 lines/mm was designed and fabricated for use with a soft X-ray flat field spectrograph covering the 0.7-6 nm region. The varied-line-spaced grating pattern was generated by use of an aspheric wave-front recording system and the laminar-type grooves were formed by a reactive ion-etching method. The performance of the grating was evaluated by using a molybdenum K X-ray generator and a spectrograph with a CCD imaging detector. Also the absolute diffraction efficiencies of 0th, 1st, 2nd, and 3rd spectral orders were measured by use of the reflectometers installed at synchrotron radiation beamlines. The experimental results showed that the holographic grating indicated comparable spectral resolution and maximum first-order diffraction efficiency ($$>$$2%) at $$sim$$2 nm with a replica grating made from a mechanically ruled varied-line-spacing grating, and it also showed higher efficiency in $$<$$1.0nm region and lower level higher order light over the whole wavelength range than the replica grating.

Journal Articles

Proposal for a chopper spectrometer with very high energy resolution

Oyama, Kenji*; Ito, Shinichi*; Otomo, Toshiya*; Osakabe, Toyotaka; Suzuki, Junichi; Matsuda, Masaaki; Kuwahara, Keitaro*; Arai, Masatoshi*

Applied Physics A, 74(Suppl.1), p.S1598 - S1600, 2002/12

 Times Cited Count:2 Percentile:87.82(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

High counting rate two-dimensional neutron imaging method using rectangular scintillators with WLS fibers

To, Kentaro; Katagiri, Masaki; Sakasai, Kaoru; Matsubayashi, Masahito; Birumachi, Atsushi; Takahashi, Hiroyuki*; Nakazawa, Masaharu*

Applied Physics A, 74(Suppl.1), p.S1601 - S1603, 2002/12

 Times Cited Count:5 Percentile:74.58(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

High position-resolution scintillation neutron-imaging detector by crossed-fiber readout with novel centroid finding method

Katagiri, Masaki; To, Kentaro; Sakasai, Kaoru; Matsubayashi, Masahito; Birumachi, Atsushi; Takahashi, Hiroyuki*; Nakazawa, Masaharu*

Applied Physics A, 74(Suppl.1), p.S1604 - S1606, 2002/12

 Times Cited Count:5 Percentile:74.58(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

XAS and XPS combined analysis using high-resolution and high-flux soft X-ray from synchrotron radiation

Matsubayashi, Nobuyuki*; Tanaka, Tomoaki*; Imamura, Motoyasu*; Shimada, Hiromichi*; Saito, Takeru

Analytical Sciences (CD-ROM), 17(Suppl.), p.119 - 121, 2002/03

no abstracts in English

98 (Records 1-20 displayed on this page)