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Izumi, Yudai*; Tanabe, Maiko*; Momoki, Yohei*; Nakagawa, Kazumichi*; Agui, Akane; Muro, Takayuki*
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no abstracts in English
Mannan, M. A.*; Baba, Yuji; Sekiguchi, Tetsuhiro; Shimoyama, Iwao; Hirao, Norie; Narita, Ayumi; Noguchi, Hideyuki*; Nagano, Masamitsu*
no journal, ,
no abstracts in English
Saito, Yuji; Fukuda, Yoshihiro; Takeda, Yukiharu; Hara, Toru*; Shirasawa, Katsutoshi*; Takeuchi, Masao*; Kitamura, Hideo*
no journal, ,
The SPring-8 BL23SU (JAEA Actinide Science beamline) has been upgraded by the replacement of the original APPLE-2 type undulator with a twin helical undulator using in-vacuum devices. Recently, polarization switching between beams of opposite helicity at 1 Hz has reached operational status. The test results clearly show that the new light source is very well suited for the measurement of precision X-ray absorption, magnetic circular dichroism, spectra, as well as element-specifc hysteresis loops.
emission spectraImazono, Takashi; Nishikino, Masaharu; Kawachi, Tetsuya; Koike, Masato; Koeda, Masaru*; Nagano, Tetsuya*; Sasai, Hiroyuki*; Oue, Yuki*; Yonezawa, Zeno*; Kuramoto, Satoshi*; et al.
no journal, ,
no abstracts in English
molecular orbital calculationsShimoyama, Iwao; Sekiguchi, Tetsuhiro; Baba, Yuji
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no abstracts in English
Koswattage, K.; Shimoyama, Iwao; Sekiguchi, Tetsuhiro; Nakagawa, Kazumichi*
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no abstracts in English
Okamoto, Yoshihiro; Shiwaku, Hideaki; Suzuki, Shinichi; Kobayashi, Toru; Yaita, Tsuyoshi
no journal, ,
Imaging XAFS technique using X-ray CCD camera was developed by analyzing gray-scale of pictures. In this technique, the CCD camera is used in place of ion chamber. Position sensitivity could be obtained by the imaging XAFS analysis. In the next step, we tried to use it in the study of uranium and minor actinide compounds. It means the imaging XAFS technique can be used to study of nuclear energy research field.
Tode, Mayumi; Harries, J.; Teraoka, Yuden; Yoshigoe, Akitaka
no journal, ,
In order to study the relationships between the thermal desorption of hydrogen and the surface properties, we have used high-resolution synchrotron radiation X-ray photoelectron spectroscopy to study the thermal degeneration processes of the surface layers. All experiments have been conducted at the surface chemistry experimental station (SUREAC2000) at BL23SU, SPring-8. After the surface of V had been cleaned, the deuterium ion was implanted. An artificial oxide layer was formed with a supersonic oxygen molecular beam. V-2p and O1s peaks were observed by SR-XPS. An artificial oxide layer is degeneration between 300 K and 373 K. The desorption of deuterium ion was observed at about 473 K.
Fujii, Kentaro; Yokoya, Akinari
no journal, ,
To in-vestigate the mechanism of the molecular change in DNA irradiated with the soft X-rays, we have measured the spectra of the X-ray absorption near edge structure (NEXAFS) of DNA caused by exposure to monochromatic soft X-rays. We used a calf thymus DNA and oligonucleotide thin films as samples and observed N K-shell and O K-shell XANES spectral changes. The typical monochromatic soft X-ray energies used for the irradiation (380, 435, 560, and 760 eV) were obtained from SPring-8, BL23SU. The observed spectra showed that initiation of the new products by the irradiation in the irradiated sample and the dissociation of molecular structure of the DNA by the irradiation. By comparison of these XANES spectral changes with the yields of base lesions and strand breaks as final products, we will discuss the molecular structure of DNA damage site and the site selectivity of damage induction in DNA by soft X-rays.
Shobu, Takahisa; Kim, S.*; Toyokawa, Hidenori*
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no abstracts in English
Fujishiro, Tomoyuki; Shobu, Takahisa; Terasawa, Michitaka*; Yamamoto, Atsushi*; Kiriyama, Koji*; Nakahigashi, Shigeo*; Hasegawa, Tadayuki*
no journal, ,
no abstracts in English
Kado, Masataka
no journal, ,
X-ray imaging of various biological cells have been studied. However it has not studied what organelle corresponded to the inside structures of the observed cells in the X-ray images. We cultivated Leydig cells on the silicon nitride membranes and the cells were stained, fixed, and observed with a fluorescent microscope. After the observation with the fluorescent microscope the cells were observed with an X-ray microscope. Obtained images by both of the fluorescent microscope and the X-ray microscope were compared and the mitochondria in the X-ray images were identified.
Ogawa, Shuichi*; Yamaguchi, Hisato*; Hozumi, Hideaki*; Kaga, Toshihide*; Eda, Goki*; Mattevi, C.*; Yoshigoe, Akitaka; Ishizuka, Shinji*; Teraoka, Yuden; Yamada, Takatoshi*; et al.
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no abstracts in English
beam on Ni(111) surface depending on kinetic energyInoue, Keisuke*; Teraoka, Yuden; Kawakami, Yasunori*; Hiraya, Atsunari*
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The oxidation states of Ni(111) surface, which were made by irradiation of supersonic O molecular beam, were analyzed by synchrotron radiation photoemission spectroscopy. After irradiation of SSOMB on the Ni(111) surface to some extent, the evolution of surface oxides were observed by core level photoemission spectra of Ni3p and O1s using SR-XPS. The surface temperature was kept to be 300 K during SSOMB irradiation and SR-XPS measurements. The SR energy was 680 eV. Oxygen uptake curves were measured at every translational energy of O beam. The initial sticking probability increased as translational energy increased from 0.3 eV to 1.0 eV, slightly decreased toward 2.2 eV, and a remarkable re-increase was observed in the region around 2.3 eV. These result show existence of two potential barriers.
Narita, Ayumi; Baba, Yuji; Sekiguchi, Tetsuhiro; Shimoyama, Iwao; Hirao, Norie; Yaita, Tsuyoshi
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no abstracts in English
-ray sources and future plans at the compact ERLHajima, Ryoichi
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Oka, Toshitaka; Yokoya, Akinari; Fukuda, Yoshihiro; Fujii, Kentaro
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Sugaya, Yuki; Shiraishi, Iyo; Shiina, Takuya; Fujii, Kentaro; Yokoya, Akinari
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Kobayashi, Toru; Yaita, Tsuyoshi; Shiwaku, Hideaki; Suzuki, Shinichi; Okamoto, Yoshihiro
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Katayama, Yoshinori; Saito, Hiroyuki
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In high-temperature high-pressure X-ray diffraction experiments using a large-volume press, a sharp collimator is used to remove background scattering. An energy-dispersive X-ray diffraction method is efficient because a whole diffraction pattern can be measured at a fixed diffraction angle. However, several measurements at different diffraction angles are necessary for wide-Q range measurements in liquid studies. We have constructed a system with a multi-element SSD with four 8 mm 
8 mm elements to reduce data acquisition time. To remove background scattering a multi-channel collimator was developed. Experiments were carried out using a cubic-type multi-anvil press on BL14B1 beamline at SPring-8. We have tested the SSD and evaluated the multi-channel collimator, and confirmed that simultaneous measurements are possible.