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Journal Articles

Relationship between viscosity and acyl tail dynamics in lipid bilayers

Nagao, Michihiro*; Kelley, E. G.*; Faraone, A.*; Saito, Makina*; Yoda, Yoshitaka*; Kurokuzu, Masayuki*; Takata, Shinichi; Seto, Makoto*; Butler, P. D.*

Physical Review Letters, 127(7), p.078102_1 - 078102_7, 2021/08

https://doi.org/10.1103/PhysRevLett.127.078102
 Times Cited Count：24 Percentile：88.23(Physics, Multidisciplinary)

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

https://doi.org/10.1038/srep20861
 Times Cited Count：10 Percentile：42.27(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

https://doi.org/10.1063/1.4917189
 Times Cited Count：2 Percentile：8.73(Physics, Applied)

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

https://doi.org/10.1107/S1600577514028306
 Times Cited Count：11 Percentile：51.37(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

https://doi.org/10.2138/am.2014.4659
 Times Cited Count：7 Percentile：23.06(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

https://doi.org/10.1007/s10751-013-0995-2
 Times Cited Count：3 Percentile：68.90(Physics, Atomic, Molecular & Chemical)

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

https://doi.org/10.7566/JPSJ.83.044708
 Times Cited Count：4 Percentile：33.86(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

https://doi.org/10.1063/1.4866280
 Times Cited Count：21 Percentile：63.92(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

https://doi.org/10.1016/j.jallcom.2013.03.271
 Times Cited Count：8 Percentile：41.53(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

https://doi.org/10.1007/s10751-011-0488-0
 Times Cited Count：4 Percentile：86.88(Physics, Atomic, Molecular & Chemical)

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

https://doi.org/10.1007/s10751-011-0470-x
 Times Cited Count：2 Percentile：76.44(Physics, Atomic, Molecular & Chemical)

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

https://doi.org/10.1107/S0909049511049958
 Times Cited Count：20 Percentile：67.24(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

https://doi.org/10.1143/JPSJ.81.034714
 Times Cited Count：3 Percentile：26.20(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

https://doi.org/10.1103/PhysRevLett.107.025501
 Times Cited Count：30 Percentile：77.72(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

https://doi.org/10.1143/JJAP.48.120221
 Times Cited Count：9 Percentile：36.02(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.

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

https://doi.org/10.1103/PhysRevLett.102.217602
 Times Cited Count：58 Percentile：87.91(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.

Journal Articles

Conversion electron and X-ray M$"o$ssbauer spectroscopies using synchrotron radiation

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

Japanese Journal of Applied Physics, 47(9), p.7136 - 7139, 2008/10

https://doi.org/10.1143/JJAP.47.7136
 Times Cited Count：8 Percentile：32.87(Physics, Applied)

no abstracts in English

Journal Articles

Development of neV-resolution spectroscopy using synchrotron-based $$^{57}$$Fe M$"o$ssbauer radiation

Masuda, Ryo; Mitsui, Takaya; Kitao, Shinji*; Higashitaniguchi, Satoshi*; Yoda, Yoshitaka*; Seto, Makoto

Japanese Journal of Applied Physics, 47(10), p.8087 - 8090, 2008/10

https://doi.org/10.1143/JJAP.47.8087
 Times Cited Count：13 Percentile：46.42(Physics, Applied)

A synchrotron-radiation-based neV-resolution spectrometer has been developed using single-line pure nuclear Bragg reflection. The developed optical system consists of two components: a $$^{57}$$FeBO$$_{3}$$ single crystal near the N$'e$el temperature for producing $$^{57}$$Fe M$"o$ssbauer radiation from synchrotron radiation, and a single-line M$"o$ssbauer absorber ($$^{57}$$Fe-enriched stainless steel foil) for analyzing the energy distribution. As a feasibility study, we have performed the measurement of the M$"o$ssbauer radiation diffracted by a Si crystal under ultrasound vibration with the optical system and have successfully observed the neV-range energy modulation due to the ultrasound vibration.

Journal Articles

Variable-frequency nuclear monochromator using single-line pure nuclear Bragg reflection of oscillating $$^{57}$$FeBO$$_{3}$$ single crystal

Mitsui, Takaya; Seto, Makoto; Masuda, Ryo

Japanese Journal of Applied Physics, Part 2, 46(38), p.L930 - L932, 2007/10

https://doi.org/10.1143/JJAP.46.L930
 Times Cited Count：17 Percentile：54.50(Physics, Applied)

A variable-frequency $$^{57}$$Fe nuclear monochromator has been developed using a pure nuclear Bragg reflection from an oscillating $$^{57}$$FeBO$$_{3}$$ single crystal at the N$'e$el temperature. The Doppler-shifted single-line $$^{57}$$Fe M$"o$ssbauer radiation at a fixed beam position was successfully filtered using the third-generation synchrotron radiation (SR) of SPring-8. We describe the principle of the variable-frequency M$"o$ssbauer filtering technique, the study on the beam characteristics, and some demonstrative experiments on energy-domain SR M$"o$ssbauer spectroscopy.

Journal Articles

Synchrotron radiation M$"o$ssbauer spectroscopy using Doppler-shifted 14.4 keV single line $$^{57}$$Fe-M$"o$ssbauer radiation

Mitsui, Takaya; Seto, Makoto; Masuda, Ryo; Kiriyama, Koji; Kobayashi, Yasuhiro*

Japanese Journal of Applied Physics, Part 2, 46(28), p.L703 - L705, 2007/07

https://doi.org/10.1143/JJAP.46.L703
 Times Cited Count：17 Percentile：54.50(Physics, Applied)

Synchrotron radiation M$"o$ssbauer spectroscopy was performed using a pure nuclear Bragg reflection of a $$^{57}$$FeBO$$_{3}$$ singlecrystal at the N$'e$el temperature and a Bragg reflection of an oscillating Si single crystal. The developed optical systemfor nuclear diffraction could produce a Doppler-shifted 14.4 keV single-line $$^{57}$$Fe-M$"o$ssbauer radiation and it enabled us to observe the energy-domain synchrotron radiation M$"o$ssbauer spectrum with an absorber at rest.

58 (Records 1-20 displayed on this page)