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Koike, Masato; Imazono, Takashi; Sano, Kazuo*; Sasai, Hiroyuki*
no journal, ,
The grate demands for emission spectroscopy have been occurred from synchrotron radiations and soft X-ray laser lights research as well as the nano-scale characterizations by use of transmission electron microscopes. To perform these experiments it is necessary to develop high efficiency spectrographs optimized for emission and florescence analysis in a 1-3 keV region. We have developed a flat-field laminar-type Au-coated holographic grating and succeeded to observe an emission band in 1.7keV region at the incidence angle of 88.65 deg. However, its diffraction efficiency is 
1% in the region. Therefore we have developed the multilayered gratings to improve diffraction efficiency dramatically in a 1-3 keV region. In this paper we describe the Mo/SiO
multilayered gratings (grating constant: 2400 lines/mm) for a flat-field spectrograph.
Yamada, Hidetaka; Murakami, Hiroshi; Shimada, Yukihiro
no journal, ,
no abstracts in English
Imazono, Takashi; Suzuki, Yoji; Sano, Kazuo*; Koike, Masato
no journal, ,
no abstracts in English
Agui, Akane; Kurachi, Toshitaka*; Sakurai, Hiroshi*; Tamura, Takuro*; Tanaka, Masahito*; Koizumi, Akihisa*; Kawata, Hiroshi*; Adachi, Hiromichi*
no journal, ,
no abstracts in English
Shobu, Takahisa; Konishi, Hiroyuki
no journal, ,
no abstracts in English
Okajima, Yuka; Yoneda, Yasuhiro; Nisawa, Atsushi*; Yamamoto, Masaki*; Goto, Shunji*
no journal, ,
no abstracts in English
Baba, Yuji; Sekiguchi, Tetsuhiro; Shimoyama, Iwao; Honda, Mitsunori; Hirao, Norie*; Deng, J.
no journal, ,
no abstracts in English
Izumi, Yudai*; Kamohara, Masumi*; Tanaka, Masafumi*; Imazu, Akiko*; Mimoto, Aki*; Nakagawa, Kazumichi*; Tanaka, Masahito*; Agui, Akane; Muro, Takayuki*; Matsushita, Tomohiro*
no journal, ,
no abstracts in English
Hirao, Norie*; Baba, Yuji; Sekiguchi, Tetsuhiro; Shimoyama, Iwao; Honda, Mitsunori; Narita, Ayumi
no journal, ,
no abstracts in English
Kiriyama, Koji; Shibano, Junichi*; Nishimura, Suguru*; Shobu, Takahisa; Kaneko, Hiroshi; Kajiwara, Kentaro*; Suzuki, Kenji*
no journal, ,
no abstracts in English
Okamoto, Yoshihiro; Shiwaku, Hideaki; Numakura, Masahiko; Kobayashi, Toru; Akutsu, Kazuhiro; Yaita, Tsuyoshi; Suzuki, Shinichi
no journal, ,
We have studied peculiar behaviors of lanthanide ion in molten chlorides by using high-energy XAFS measurement techniques in the SPring-8. The sample is usually used under static condition in the measurement, since it is sealed off in a quartz cell under reduced pressure. However, there are many reactions in the pyrochemistry of spent nuclear fuels. In the present study, we tried to obtain a XAFS pattern in a few minutes using the Quick scan XAFS (QXAFS) technique developed in the BL11XU, SPring-8. In the QXAFS measurement, a XAFS spectrum of the La K-absorption edge of molten salts were obtained in 5 minutes. It is far shorter than 30-60 minutes in the normal step-scan XAFS measurement. According to the data analysis, it was clarified that the QXAFS data can be used enough to observe molten salt reactions.
Y
Cu
O
studied by resonant inelastic X-ray scatteringIshii, Kenji; Ikeuchi, Kazuhiko; Inami, Toshiya; Mizuki, Junichiro; Tsutsui, Kenji; Toyama, Takami*; Maekawa, Sadamichi*; Kudo, Kazutaka*; Koike, Yoji*; Murakami, Yoichi*; et al.
no journal, ,
no abstracts in English
Numakura, Masahiko; Okamoto, Yoshihiro; Yaita, Tsuyoshi; Shiwaku, Hideaki; Suzuki, Shinichi; Kobayashi, Toru; Akutsu, Kazuhiro; Matsuura, Haruaki*
no journal, ,
The high energy XAFS using K-absorption edge is very effective to obtain information on behavior of small amount of rare earth elements in molten chlorides. In the present study, we performed the XAFS measurement to obtain the local structure change for molten TbCl
and the mixture of 40% TbCl with LiCl-KCl eutectic, 15% TbCl with LiCl-KCl eutectic and 1.5% TbCl with LiCl-KCl eutectic. We found that as the concentration of TbCl is lower, the coordination number decrease a little and become near 6 but the nearest Tb-Cl distance is almost same. In addition, we found that Debye-Waller factor become very small. We also performed molecular dynamics simulation to obtain the information of structure change. This simulation showed the intense structure change occurs at vicinity of 25% TbCl with LiCl-KCl eutectic. Its simulation result accorded with this XAFS experiment result.
Yaita, Tsuyoshi; Shuk, D. K.*; Shiwaku, Hideaki; Okamoto, Yoshihiro
no journal, ,
no abstracts in English
Yoshigoe, Akitaka; Teraoka, Yuden
no journal, ,
The adsorption process in oxidation reaction of Si(111)-7
7 at 300K was investigated by real-time O1s and Si2p photoelectron spectroscopy using synchrotron radiation. All experiments were performed at SUREAC2000 at BL23SU in SPring-8. The O pressure of 5.310
Pa was controlled with a leak valve. Synchrotron radiation of about 670eV was employed to measure the alternative O1s and Si2p measurement. The chemical shifts in O1s and Si2p spectra were observed with the progress of oxidation. Several components, Si
, Si
, "ins" and "paul", were observed just after beginning oxidation. The initial increasing rate of Si and "ins" are much larger than those of Si and "paul". We found that The "paul" is the molecularly adsorbate on the top of the Si adatom bonding one oxygen atom at that backbond. The Si
oxidation states begins to appear when the "paul" begins to decrease, thus, we found that "ins-paul" decomposes to form "ad-insx2" structure. The time evolution of adsorption states up to saturation coverage is observed and the correlation between Si oxidation states and oxygen bond configurations is clarified.
Yoshigoe, Akitaka; Teraoka, Yuden
no journal, ,
In order to clarify the O adsorption dynamics on Si(111)-77, the temperature dependence of initial sticking probability, S0, was studied by synchrotron radiation real-time O1s photoelectron spectroscopy. All experiments were carried out with SUREAC2000 at BL23SU in SPring-8. Translational kinetic energy of O is controlled up to 2.3eV. Normal gas exposure experiment was performed by using leak valve. The surface temperature is selected to be 300K, 450K, 600K and 750K. Synchrotron radiation of 670eV was employed to measure the real-time O1s XPS. S0 was defined to be the coverage difference at the zero exposure. At high energy condition (0.15eV, 2.23eV) where S0 is virtually independence of incident energy, no variation of S0 depending on surface temperature was observed within the margin of error. This result imply that the direct adsorption mechanism is dominat in this energy condition. On the other hand, S0 decreases with increasing the surface temperature in the low energy condition. Thus, it is expected that the trapping-mediated adsorption mechanism is dominant. The adsorption mechanism clarified from the temperature dependence of S0 is consitent with that obtained from incident energy dependence.
Hajima, Ryoichi; Nagai, Ryoji; Iijima, Hokuto; Nishimori, Nobuyuki
no journal, ,
We are developing an electron gun for future ERL light sources, which produces coherent X-ray and femto-second X-ray. The gun is a 250-kV DC gun equipped with a semiconductor photo cathode. We present recent results of the gun development including stabilization of the DC high-voltage circuit, assembling of vacuum chambers, design and construction of solenoid magnet and so on.
Sakanaka, Shogo*; Kobayashi, Yukinori*; Hajima, Ryoichi; Nakamura, Norio*
no journal, ,
A collaborative effort towards a future ERL light source is carried out by JAEA, KEK and ISSP. We present recent results of the ERL project, which includes development of ERL components and design studies of a compact ERL.
Shiwaku, Hideaki; Yaita, Tsuyoshi; Okamoto, Yoshihiro; Narita, Hirokazu*; Tanida, Hajime*
no journal, ,
no abstracts in English
studied by angle-resolved soft X-ray photoemission spectroscopyOkochi, Takuo; Fujimori, Shinichi; Toshimitsu, Takafumi; Okane, Tetsuo; Saito, Yuji; Fujimori, Atsushi*; Yamagami, Hiroshi*; Haga, Yoshinori; Yamamoto, Etsuji; Ikeda, Shugo; et al.
no journal, ,
We investigated the temperature dependence of the density of states and the band structure of ferromagnetic uranium compound, UIr, by the soft X-ray angle integrated / resolved photoemission spectroscopy. We observed the exchange splitting of the density of states as well as the representative 5
band. These results suggest that the ferromagnetism of UIr is well explained by the Stoner model (itinerant-magnetism model).