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Journal Articles

$$^{61}$$Ni synchrotron radiation-based M$"o$ssbauer spectroscopy of nickel-based nanoparticles with hexagonal structure

Masuda, Ryo*; Kobayashi, Yasuhiro*; Kitao, Shinji*; Kurokuzu, Masayuki*; Saito, Makina*; Yoda, Yoshitaka*; Mitsui, Takaya; Hosoi, Kohei*; Kobayashi, Hirokazu*; Kitagawa, Hiroshi*; et al.

Scientific Reports (Internet), 6, p.20861_1 - 20861_8, 2016/02

 Times Cited Count:5 Percentile:61.22(Multidisciplinary Sciences)

Journal Articles

Attempt to measure magnetic hyperfine fields in metallic thin wires under spin Hall conditions using synchrotron-radiation M$"o$ssbauer spectroscopy

Mibu, Ko*; Mitsui, Takaya; Tanaka, Masaaki*; Masuda, Ryo*; Kitao, Shinji*; Kobayashi, Yasuhiro*; Yoda, Yoshitaka*; Seto, Makoto*

Journal of Applied Physics, 117(17), p.17E126_1 - 17E126_4, 2015/05

 Times Cited Count:2 Percentile:86.45(Physics, Applied)

Journal Articles

Silicon avalanche photodiode linear-array detector with multichannel scaling system for pulsed synchrotron X-ray experiments

Kishimoto, Shunji*; Mitsui, Takaya; Haruki, Rie*; Yoda, Yoshitaka*; Taniguchi, Takashi*; Shimazaki, Shoichi*; Ikeno, Masahiro*; Saito, Masatoshi*; Tanaka, Masanobu*

Journal of Instrumentation (Internet), 10(5), p.C05030_1 - C05030_6, 2015/05

 Times Cited Count:5 Percentile:64.8(Instruments & Instrumentation)

Journal Articles

$$^{57}$$Fe polarization dependent synchrotron M$"o$ssbauer spectroscopy using a diamond phase plate and an iron borate nuclear Bragg monochromator

Mitsui, Takaya; Imai, Yasuhiko*; Masuda, Ryo*; Seto, Makoto*; Mibu, Ko*

Journal of Synchrotron Radiation, 22(2), p.427 - 435, 2015/03

 Times Cited Count:4 Percentile:66.15(Instruments & Instrumentation)

Journal Articles

High-pressure radiative conductivity of dense silicate glasses with potential implications for dark magmas

Murakami, Motohiko*; Goncharov, A. F.*; Hirao, Naohisa*; Masuda, Ryo*; Mitsui, Takaya; Thomas, S. M.*; Bina, C. R.*

Nature Communications (Internet), 5, p.5428_1 - 5428_6, 2014/11

 Times Cited Count:12 Percentile:48.43(Multidisciplinary Sciences)

Journal Articles

Nuclear resonant scattering measurements on $$^{57}$$Fe by multichannel scaling with a 64 pixel silicon avalanche photodiode linear-array detector

Kishimoto, Shunji*; Mitsui, Takaya; Haruki, Rie*; Yoda, Yoshitaka*; Taniguchi, Takashi*; Shimazaki, Shoichi*; Ikeno, Masahiro*; Saito, Masatoshi*; Tanaka, Masanobu*

Review of Scientific Instruments, 85(11), p.113102_1 - 113102_5, 2014/11

 Times Cited Count:6 Percentile:61.68(Instruments & Instrumentation)

Journal Articles

The Spin state of iron in Fe$$^{3+}$$-bearing Mg-perovskite and its crystal chemistry at high pressure

Mashimo, Izumi*; Otani, Eiji*; Hirao, Naohisa*; Mitsui, Takaya; Masuda, Ryo*; Seto, Makoto*; Sakai, Takeshi*; Takahashi, Suguru*; Nakano, Satoshi*

American Mineralogist, 99(8-9), p.1555 - 1561, 2014/08

 Times Cited Count:4 Percentile:78.53(Geochemistry & Geophysics)

Journal Articles

Development of $$^{125}$$Te synchrotron-radiation-based M$"o$ssbauer spectroscopy

Kurokuzu, Masayuki*; Kitao, Shinji*; Kobayashi, Yasuhiro*; Saito, Makina*; Masuda, Ryo*; Mitsui, Takaya; Yoda, Yoshitaka*; Seto, Makoto*

Hyperfine Interactions, 226(1), p.687 - 691, 2014/04

 Times Cited Count:2 Percentile:34.79

Journal Articles

$$^{125}$$Te synchrotron-radiation-based M$"o$ssbauer spectroscopy of Fe$$_{1.1}$$Te and FeTe$$_{0.5}$$Se

Kurokuzu, Masayuki*; Kitao, Shinji*; Kobayashi, Yasuhiro*; Saito, Makina*; Masuda, Ryo*; Mitsui, Takaya; Yoda, Yoshitaka*; Seto, Makoto*

Journal of the Physical Society of Japan, 83(4), p.044708_1 - 044708_4, 2014/04

 Times Cited Count:1 Percentile:85.34(Physics, Multidisciplinary)

Journal Articles

Synchrotron radiation-based M$"o$ssbauer spectra of $$^{174}$$Yb measured with internal conversion electrons

Masuda, Ryo*; Kobayashi, Yasuhiro*; Kitao, Shinji*; Kurokuzu, Masayuki*; Saito, Makina*; Yoda, Yoshitaka*; Mitsui, Takaya; Iga, Fumitoshi*; Seto, Makoto

Applied Physics Letters, 104(8), p.082411_1 - 082411_5, 2014/02

 Times Cited Count:9 Percentile:51.39(Physics, Applied)

A detection system for synchrotron-radiation (SR)-based M$"o$ssbauer spectroscopy was developed to enhance the nuclear resonant scattering counting rate and thus increase the available nuclides. In the system, a windowless avalanche photodiode (APD) detector was combined with a vacuum cryostat to detect the internal conversion (IC) electrons and fluorescent X-rays accompanied by nuclear de-excitation. As a feasibility study, the SR-based M$"o$ssbauer spectrum using the 76.5 keV level of $$^{174}$$Yb was observed without $$^{174}$$Yb enrichment of the samples. The counting rate was five times higher than that of our previous system, and the spectrum was obtained within 10 h. This result shows that nuclear resonance events can be more efficiently detected by counting IC electrons for nuclides with high IC coefficients. Furthermore, the windowless detection system enables us to place the sample closer to the APD elements and is advantageous for nuclear resonant inelastic scattering measurements. Therefore, this detection system can not only increase the number of nuclides accessible in SR-based M$"o$ssbauer spectroscopy but also allows the nuclear resonant inelastic scattering measurements of small single crystals or enzymes with dilute probe nuclides that are difficult to measure with the previous detection system.

Journal Articles

In situ synchrotron $$^{57}$$Fe M$"o$ssbauer spectroscopy of RFe$$_{2}$$ (R = Y, Gd) hydrides synthesized under ultra-high-pressure hydrogen

Mitsui, Takaya; Masuda, Ryo*; Seto, Makoto; Hirao, Naohisa*; Matsuoka, Takehiro*; Nakamura, Yumiko*; Sakaki, Koji*; Enoki, Hirotoshi*

Journal of Alloys and Compounds, 580(Suppl.1), p.S264 - S267, 2013/12

 Times Cited Count:3 Percentile:70.89(Chemistry, Physical)

Journal Articles

Synchrotron radiation $$^{57}$$Fe-M$"o$ssbauer spectroscopy using nuclear monochromator

Mitsui, Takaya; Masuda, Ryo; Hirao, Naohisa*; Mibu, Ko*; Seto, Makoto

Hyperfine Interactions, 204(1-3), p.97 - 100, 2012/04

 Times Cited Count:1 Percentile:34.1

Journal Articles

An in situ M$"{o}$ssbauer study using synchrotron radiation

Masuda, Ryo; Mitsui, Takaya; Ito, Keiji*; Sakaki, Koji*; Enoki, Hirotoshi*; Nakamura, Yumiko*; Seto, Makoto

Hyperfine Interactions, 204(1-3), p.139 - 142, 2012/03

 Times Cited Count:2 Percentile:20.21

We have been developing a system for in situ M$"{o}$ssbauer studies using synchrotron radiation (SR) to elucidate the mechanism of hydrogenation processes. In the system, samples reacts in an atmosphere chamber and SR-based M$"{o}$ssbauer spectra using variable-frequency nuclear monochromator and energy spectra of inelastic nuclear resonant scattering (NRS) of SR are measured. As a feasibility study, the temperature dependence of the M$"{o}$ssbauer and inelastic NRS spectra of $$^{57}$$Fe in $$c$$-GdFe$$_2$$H$$_3$$ under vacuum were measured. In both spectra, clear differences were observed between 373 K and 573 K. These differences can be interpreted by the change of microscopic environment around Fe at the dehydrogenation. Thus, it is confirmed that this system works well enough to perform the in-situ M$"{o}$ssbauer study on the dehydrogenation of $$c$$-GdFe$$_2$$H$$_3$$.

Journal Articles

Grazing-incidence synchrotron-radiation $$^{57}$$Fe-M$"o$ssbauer spectroscopy using a nuclear Bragg monochromator and its application to the study of magnetic thin films

Mitsui, Takaya; Masuda, Ryo*; Seto, Makoto; Suharyadi, E.*; Mibu, Ko*

Journal of Synchrotron Radiation, 19(2), p.198 - 204, 2012/03

 Times Cited Count:8 Percentile:53.47(Instruments & Instrumentation)

An energy-domain grazing-incidence $$^{57}$$Fe-M$"o$ssbauer spectroscopy(E-GIMS) with synchrotron radiation (SR) has been developed to studysurface and interface structures of thin films. A high-brilliant $$^{57}$$Fe-M$"o$ssbauer radiation, filtered from SR by a $$^{57}$$FeBO$$_{3}$$ single crystal nuclear Bragg monochromator (NBM), allows us to perform the conventional M$"o$ssbauer spectroscopy (MS) for the dilute $$^{57}$$Fe in a mirror-like film in any bunch-mode operation of SR. Theoretical and experimental study of the specular reflections from isotope-enriched ($$^{57}$$Fe: 95%) and natural-abundance ($$^{57}$$Fe: $$sim$$2%) iron thin films has been carried out to clarify the basic features of coherent interference between electronic and nuclear resonant scattering of $$^{57}$$Fe-Mo"ssbauer radiation in thin films. Moreover, a new surface and interface sensitive method has been developed by the combination of SR based E-GIMS and $$^{57}$$Fe-probe layer technique, which enables us to probe interfacial complex magnetic structures in thin film with atomic-scale depth resolution.

Journal Articles

M$"{o}$ssbauer study on the SmFe$$_2$$ hydride through $$^{149}$$Sm and $$^{57}$$Fe

Masuda, Ryo; Mitsui, Takaya; Ito, Keiji*; Kobayashi, Yasuhiro*; Kitao, Shinji*; Seto, Makoto

Journal of the Physical Society of Japan, 81(3), p.034714_1 - 034714_6, 2012/03

 Times Cited Count:2 Percentile:77.87(Physics, Multidisciplinary)

Journal Articles

Structural and valence changes of europium hydride induced by application of high-pressure H$$_{2}$$

Matsuoka, Takahiro*; Fujihisa, Hiroshi*; Hirao, Naohisa*; Oishi, Yasuo*; Mitsui, Takaya; Masuda, Ryo; Seto, Makoto*; Yoda, Yoshitaka*; Shimizu, Katsuya*; Machida, Akihiko; et al.

Physical Review Letters, 107(2), p.025501_1 - 025501_4, 2011/07

 Times Cited Count:18 Percentile:27.99(Physics, Multidisciplinary)

Europium-hydride EuH$$_{x}$$ exposed to high-pressure H$$_{2}$$ conditions has been found to exhibit structural and valence changes, $$Pnma$$ ($$x$$=2, divalent) $$rightarrow$$ $$P$$63/$$mmc$$ ($$x$$=2, 7.2-8.7 GPa) $$rightarrow$$ $$I$$4/$$m$$ ($$x$$$$>$$2, 8.7-9.7 GPa) $$rightarrow$$ $$I$$4/$$mmm$$ ($$x$$$$>$$2, 9.7 GPa-, trivalent). Having trivalent character and distorted cubic fcc structure, the $$I$$4/$$mmm$$ structure is the $$beta$$-phase which has been commonly observed for other rare-earth metal hydrides. Our study clearly demonstrates that EuH$$_{x}$$ is no longer an "irregular" member of the rare earth metal hydrides.

Journal Articles

A Spectrometer for rayleigh scattering of M${"o}$ssbauer radiation using synchrotron radiation

Masuda, Ryo; Mitsui, Takaya; Kobayashi, Yasuhiro*; Higashitaniguchi, Satoshi*; Seto, Makoto

Japanese Journal of Applied Physics, 48(12), p.120221_1 - 120221_3, 2009/12

 Times Cited Count:5 Percentile:74.54(Physics, Applied)

A neV-resolution spectrometer using 14.4 keV synchrotron-based $$^{57}$$Fe M${"o}$ssbauer radiation has been developed to observe the quasi-elastic scattering by condensed matter. It consists of a $$^{57}$$Fe$$_2$$O$$_3$$ nuclear resonant Bragg monochromator and a $$^{57}$$Fe stainless steel nuclear analyzer. As a feasibility study, the quasi-elastic scattering by supercooled glycerol near its melting point has been observed. The instrumental function of the spectrometer was 42.2 neV. The energy broadening of 11 neV due to the quasi-elastic scattering was observed.

JAEA Reports

A Laboratory X-ray measurement system of the crystallinity of single crystal for the synchrotron radiation optics

Kiriyama, Koji; Mitsui, Takaya; Fukuda, Yoshihiro

JAEA-Technology 2009-035, 24 Pages, 2009/07


Single crystal for experiment using by synchrotron radiation X-ray is needed to have high quality and performance as optics element. Therefore, quantitative estimation of performance of the single crystal must be done before the experiment. Precise X-ray optics system has been developed at JAEA/Quantum Beam Science Directorate/Synchrotron Radiation Unit at SPring-8. This system can measure small sample that is less than 0.01 mm in size, and have resolving ability of sample rotation that is less than 0.01 degree. And, scanning of sample, it is possible to measure distribution of quality at sample surface. For example, single crystal of FeBO$$_{3}$$ which was measured by this system have been installed in synchrotron radiation M$"o$ssbauer spectroscopy using Doppler-shifted 14.4 keV single line $$^{57}$$Fe-M$"o$ssbauer radiation.

JAEA Reports

Introduction of liquid nitrogen cryogenic cooling system and development of multi-crystal switching system on BL11XU at SPring-8

Shiwaku, Hideaki; Mitsui, Takaya; Tozawa, Kazukiyo*

JAEA-Research 2009-009, 60 Pages, 2009/07


The liquid nitrogen circulation cooling device for a double crystal monochromator was introduced, and the multi-crystal switching system was developed on the JAEA dedicated beamline "BL11XU" at SPring-8. The multi-crystal switching system has features to be able to exchange crystals in cryogenic temperature and in a vacuum at any time. By this system, it is available to use high flux X-rays energy range of 6 to 70 keV.

Journal Articles

Synchrotron-radiation-based M$"o$ssbauer spectroscopy

Seto, Makoto; Masuda, Ryo; Higashitaniguchi, Satoshi*; Kitao, Shinji*; Kobayashi, Yasuhiro*; Inaba, Chika*; Mitsui, Takaya; Yoda, Yoshitaka*

Physical Review Letters, 102(21), p.217602_1 - 217602_4, 2009/05

 Times Cited Count:40 Percentile:14.1(Physics, Multidisciplinary)

We have developed a new method that yields M$"o$ssbauer absorption spectra using synchrotron radiation (SR); this method is applicable for almost all M$"o$ssbauer nuclides including those that cannot be measured by previous methods using radioisotope (RI) sources. The M$"o$ssbauer spectrum of the 68.752 keV excited state of $$^{73}$$Ge, which cannot be measured using a RI source, was measured using SR. Our results show that this method can be used to perform advanced M$"o$ssbauer spectroscopy measurements owing to the excellent features of SR.

71 (Records 1-20 displayed on this page)