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Journal Articles

Reaction path and product analysis of sodium-water chemical reactions using laser diagnostics

Deguchi, Yoshihiro*; Muranaka, Ryota*; Kamimoto, Takahiro*; Takagi, Taku*; Kikuchi, Shin; Kurihara, Akikazu

Applied Thermal Engineering, 114, p.1319 - 1324, 2017/03

 Times Cited Count:2 Percentile:13.03(Thermodynamics)

The purpose of this study aims to clarify the gas phase sodium-water reaction path and reaction products quantitatively. The counter-flow diffusion experiment device was employed to analyze the reaction path and reaction products using laser diagnostics. The main product of sodium-water reaction was determined to be NaOH and the sodium oxide was not notably measured compared with NaOH.

Journal Articles

Reaction path and product analysis of sodium-water chemical reactions using laser diagnostics

Deguchi, Yoshihiro*; Muranaka, Ryota*; Kamimoto, Takahiro*; Takagi, Taku*; Kikuchi, Shin; Kurihara, Akikazu

Proceedings of 3rd International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control (IWHT 2015) (CD-ROM), 6 Pages, 2015/10

The purpose of this study aims to clarify the gas phase sodium-water reaction path and reaction products quantitatively. The counter-flow diffusion experiment device was employed to analyze the reaction path and reaction products using laser diagnostics. The main product of sodium-water reaction was determined to be NaOH and the sodium oxide was not notably measured compared with NaOH.

Journal Articles

Characteristic oxygen $$K$$-edge circular dichroism spectra of amino acid films by improved measurement technique

Izumi, Yudai*; Tanabe, Maiko*; Imazu, Akiko*; Mimoto, Aki*; Tanaka, Masahito*; Agui, Akane; Muro, Takayuki*; Nakagawa, Kazumichi*

Journal of Chemical Physics, 138(7), p.074305_1 - 074305_10, 2013/02

 Times Cited Count:9 Percentile:32.39(Chemistry, Physical)

no abstracts in English

Journal Articles

Quantitative measurement of hard X-ray spectra for high intensity laser produced plasma

Zhang, Z.*; Nishimura, Hiroaki*; Namimoto, Takura*; Fujioka, Shinsuke*; Arikawa, Yasunobu*; Nishikino, Masaharu; Kawachi, Tetsuya; Sagisaka, Akito; Hosoda, Hirokazu*; Orimo, Satoshi; et al.

Review of Scientific Instruments, 83(5), p.053502_1 - 053502_5, 2012/05

 Times Cited Count:18 Percentile:62.46(Instruments & Instrumentation)

X-ray line spectra ranging from 17 to 77 keV were quantitatively measured with a Laue spectrometer, composed of a cylindrically curved crystal and a detector. Either a visible CCD detector coupled with a CsI phosphor screen or an imaging plate can be chosen, depending on the signal intensities and exposure times. The absolute sensitivity of the spectrometer system was calibrated using pre-characterized laser-produced X-ray sources and radioisotopes. The integrated reflectivity for the crystal is in good agreement with predictions by an open code for X-ray diffraction. The energy transfer efficiency from incident laser beams to hot electrons, as the energy transfer agency for specific X-ray line emissions, is derived as a consequence of this work.

Journal Articles

Measurement and comparison of absolute value of soft X-ray natural circular dichroism of serine and alanine

Izumi, Yudai*; Imazu, Akiko*; Mimoto, Aki*; Tanaka, Masafumi*; Nakagawa, Kazumichi*; Tanaka, Masahito*; Agui, Akane; Muro, Takayuki*

Journal of Physics; Conference Series, 190, p.012209_1 - 012209_4, 2009/11

 Times Cited Count:8 Percentile:87.32

Soft X-ray natural circular dichroism spectra of serine and alaninethin films, were measured in absolute value with the focus at the oxygen 1s to $$pi$$$$^{*}$$ transition of COO$$^{-}$$. The soft X-ray natural circular dichroism spectra intensity of L-Ala was about ten times as large as that of L-Ser. Those differences would reflect the chiral environment of the core hole oxygen atoms of COO$$^{-}$$.

JAEA Reports

Handling of HTTR second driver fuel elements in assembling and storage working

Tomimoto, Hiroshi; Kato, Yasushi; Owada, Hiroyuki; Sato, Nao; Shimazaki, Yosuke; Kozawa, Takayuki; Shinohara, Masanori; Hamamoto, Shimpei; Tochio, Daisuke; Nojiri, Naoki; et al.

JAEA-Technology 2009-025, 29 Pages, 2009/06

JAEA-Technology-2009-025.pdf:21.78MB

The first driver fuel of the HTTR (High Temperature Engineering test Reactor) was loaded in 1998 and the HTTR reached first criticality state in the same year. The HTTR has been operated using the first driver fuel for a decade. In Fuel elements assembling, 4770 of fuel rods which consist of 12 kinds of enrichment uranium are loaded into 150 fuel graphite blocks for HTTR second driver fuel elements. Measures of prevention of fuel rod miss loading, are employed in fuel design. Additionally, precaution of fuel handling on assembling are considered. Reception of fuel rods, assembling of fuel elements and storage of second driver fuels in the fresh fuel storage rack in the HTTR were started since June, 2008. Assembling, storage and pre-service inspection were divided into three parts. The second driver fuel assembling was completed in September, 2008. This report describes concerns of fuel handling on assembling and storage work for the HTTR fuel elements.

Oral presentation

Soft X-ray natural circulr dichoroism of amino acid

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

Oral presentation

NCD spectra of amino acid

Izumi, Yudai*; Tanaka, Masafumi*; Imazu, Akiko*; Mimoto, Aki*; Nakagawa, Kazumichi*; Tanaka, Masahito*; Agui, Akane; Muro, Takayuki*

no journal, , 

no abstracts in English

Oral presentation

Study of oxidation processes on TiAl by using X-ray photoemission spectroscopy in conjunction with synchrotron radiation

Hashinokuchi, Michihiro*; Sumimoto, Yuichi; Tode, Mayumi; Okada, Michio*; Harries, J.; Yoshigoe, Akitaka; Teraoka, Yuden; Kasai, Toshio*

no journal, , 

We have studied chemical reactions of TiAl surface with oxygen molecules by using synchrotron radiation photoelectron spectroscopy to clarify the generation process of Al oxides. The experiment was conducted with the surface chemistry experimental station (SUREAC2000) at the soft X-ray beamline (BL23SU) of Japan Atomic Energy Agency in the SPring-8 facilities. The surface (50at.%) was cleaned by Ar$$^{+}$$ ion sputtering and annealing. Comparing the Al-2p and Ti-2p XPS spectra of the clean surface with those of the surface exposed to the oxygen of 350L at 673K, it has been found that the peak position and profile were changed. It shows that both Ti and Al atoms were oxidized. Moreover, the Ti oxides was decreased by heating up to 1123K.

Oral presentation

Depth-profiling using angular-resolved X-ray photoelectron spectroscopy and the maximum entropy method

Harries, J.; Tode, Mayumi; Sumimoto, Yuichi; Inoue, Keisuke; Yoshigoe, Akitaka; Teraoka, Yuden

no journal, , 

Photoelectron spectroscopy is predominantly a surface-sensitive technique, but by recording spectra at a range of angles information on the depth-dependent distribution of elements in specific chemical states can also be obtained. Compared to other techniques such as Rutherford back-scattering, the technique has the advantage of chemical-state specificity, but the drawback that it requires very careful data analysis to produce reliable and quantitative results. Here we report progress in obtaining chemical-state depth profiles from photoelectron spectra recorded using the SUREAC2000 apparatus at SPring-8's BL23SU. Results will be presented for ARXPS data recorded for N and O layers on Al(111), and also a VCrTi sample, both in its as-received state and following deuterium ion dosing.

Oral presentation

SR-XPS study on the native oxide of VCrTi and its modification by deuterium ion implantation

Tode, Mayumi; Harries, J.; Teraoka, Yuden; Sumimoto, Yuichi; Inoue, Keisuke; Yoshigoe, Akitaka

no journal, , 

Oral presentation

Surface analysis of deuterated VCrTi by high resolution soft X-ray synchrotron radiation photoemission spectroscopy

Tode, Mayumi; Harries, J.; Teraoka, Yuden; Sumimoto, Yuichi; Inoue, Keisuke; Yoshigoe, Akitaka

no journal, , 

Study of thermal desorption characteristics of native oxide layer on the surface of the hydrogen storage materials is very important. Thermal instability of native oxide layer on VCrTi and deuterated VCrTi was observed by high resolution soft X-ray synchrotron radiation photoemission spectroscopy. All experiments have been conducted at the surface chemistry experimental station (SUREAC2000) at BL23SU, SPring-8. Before thermal annealing, the satellite peak from the native oxide layer and the V-2p peak from the bulk were observed. The O-1s peak consisted of at least two components. After thermal annealing, the O-1s peak decreases and the V-2p peak increases. Deuterium implantation affected the thermal stability of the native oxide.

Oral presentation

Chemical-state resolved depth-profiling using angle-resolved X-ray photoelectron spectroscopy and the maximum entropy method

Harries, J.; Tode, Mayumi; Sumimoto, Yuichi; Inoue, Keisuke; Yoshigoe, Akitaka; Teraoka, Yuden

no journal, , 

Using the high energy resolution surface chemistry apparatus at SPring-8's BL23SU it is possible to record angular and chemical-state resolved X-ray photoelectron spectra. Chemical-state specific depth profile information can be obtained from these spectra using the maximum entropy method. Here we describe progress made in the combination of these two techniques, with the specific example of the depth-profiling of various nitridation states present in a Al(111) sample nitrided using a supersonic molecular beam.

Oral presentation

Chemical state resolved depth-profiling using XPS and the maximum entropy method

Harries, J.; Tode, Mayumi; Inoue, Keisuke; Sumimoto, Yuichi; Yoshigoe, Akitaka; Teraoka, Yuden

no journal, , 

There are many available methods for determining the elemental distributions within a sample in the depth direction, but angle-resolved X-ray photoelectron spectroscopy offers the advantage of chemica-state specificity. At the surface chemistry station at BL23SU, SPring-8, we have recorded depth-profiles for thin films generated using supersonic molecular beams and ion beams. To extract the depth-direction information from the angular resolved spectra we use the maximum entropy method. We explain the techniques, and present the specific example of the natural oxide of VCrTi, a hydrogen storage material. Also, we investigate the thermal stability of the oxide by generating depth profiles during annealing of the sample.

Oral presentation

Soft X-ray natural circular dichroism of aspartic acid

Izumi, Yudai*; Imazu, Akiko*; Mimoto, Aki*; Tanabe, Maiko*; Nakagawa, Kazumichi*; Tanaka, Masahito*; Agui, Akane; Muro, Takayuki*

no journal, , 

no abstracts in English

Oral presentation

Natural circular dichroism of Asp in soft X-ray region

Izumi, Yudai*; Imazu, Akiko*; Mimoto, Aki*; Tanabe, Maiko*; Nakagawa, Kazumichi*; Tanaka, Masahito*; Agui, Akane; Muro, Takayuki*

no journal, , 

no abstracts in English

Oral presentation

Thermal stability of deuterium ion implanted hydrogen storage material (V$$_{25}$$Cr$$_{40}$$Ti$$_{35}$$) using high-resolution soft X-ray synchrotron radiation photoelectron spectroscopy

Tode, Mayumi; Harries, J.; Teraoka, Yuden; Sumimoto, Yuichi; Inoue, Keisuke; Yoshigoe, Akitaka

no journal, , 

Thermal stability of native oxide layer on the hydrogen storage materials is related to the hydrogen absorption and desorption. Thermal instability of native oxide layer on VCrTi and deuterated VCrTi was observed by high resolution soft X-ray synchrotron radiation photoemission spectroscopy. All experiments have been conducted at the surface chemistry experimental station (SUREAC2000) at BL23SU, SPring-8. After thermal annealing, the peak that shows the oxidation weakens, and the peak that shows the metal strengthens. The thermal stability of a natural oxide layer was observed to stabilize by about 100 degrees by deuterium ion implanted.

Oral presentation

Study of thermal stability on surface of deuteration VCrTi by high resolution soft X-ray synchrotron radiation photoemission spectroscopy

Tode, Mayumi; Harries, J.; Teraoka, Yuden; Sumimoto, Yuichi; Inoue, Keisuke; Yoshigoe, Akitaka

no journal, , 

Thermal stability of native oxide layer on the hydrogen storage materials is related to the hydrogen absorption and desorption. In this study, thermal degradation process of native oxide layer on VCrTi was observed by high resolution soft X-ray synchrotron radiation photoemission spectroscopy. All experiments have been conducted at the surface chemistry experimental station (SUREAC2000) at BL23SU, SPring-8. Before thermal annealing, photoemission spectrum of oxide was observed. After thermal annealing, the oxide peak was decreased, and the metal peak was increased. When the deuterium ion was implanted into the surface, the degeneration temperature of a natural oxide layer was observed to rise about 100 degrees.

Oral presentation

Soft X-ray natural circular dichroism of aspartic acid and tyrosine

Izumi, Yudai*; Tanabe, Maiko*; Imazu, Akiko*; Mimoto, Aki*; Nakagawa, Kazumichi*; Tanaka, Masahito*; Agui, Akane; Muro, Takayuki*

no journal, , 

We measured soft X-ray natural circular dichroism (SXNCD) of aspartic acid (Asp) and tyrosine (Tyr) at oxygen K-edge region, in an attempt to obtain chiral structure at the vicinity of oxygen atoms. SXNCD measurement was carried out at the BL25SU beamline of the SPring-8, Japan. We focused on oxygen COO$$^{-}$$ 1s $$pi$$$$^{*}$$ transitions around 533 eV. Since we used sublimation films which are randomly oriented samples, we could reject E1E2 mechanism and pick up only E1M1 mechanism.

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