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Journal Articles

Quick measurement of continuous absorption spectrum in ion beam pulse radiolysis; Application of optical multi-channel detector into transient species observation

Iwamatsu, Kazuhiro*; Muroya, Yusa*; Yamashita, Shinichi*; Kimura, Atsushi; Taguchi, Mitsumasa; Katsumura, Yosuke*

Radiation Physics and Chemistry, 119, p.213 - 217, 2016/02

https://doi.org/10.1016/j.radphyschem.2015.10.024

Times Cited Count：1 Percentile：10.71(Chemistry, Physical)

A quick measurement system of a continuous absorption spectrum covering a wide range from 200 to 950 nm was constructed by employing an optical multi-channel detector. Ion beam pulse radiolysis with 12.5 MeV/u He, 18.3 MeV/u C and 17.5 MeV/u Ne ions were performed with the measurement system. Transient absorption spectrum of (SCN) $_{2}$ $^{-}$ was clearly observed in KSCN aqueous solutions within a few minutes in spite of their very small absorbance, demonstrating high sensitivity of 0.001-0.003 in absorbance in the range from 260 to 660 nm as well as short measurement time of a few minutes. Two different absorption peaks attributed to Br $_{2}$ $^{-}$ and Br $_{3}$ $^{-}$ were observed simultaneously in NaBr aqueous solutions, showing powerfulness of the measurement system in overviewing chemical kinetics under ion beam irradiation especially in not well investigated chemical systems.

Journal Articles

Uranyl species in 1-Ethyl-3-methylimidazolium nitrate ([EMI][NO $_{3}$ ]) solution of [EMI] $_{2}$ [UO $_{2}$ (NO $_{3}$ ) $_{4}$ ]; First spectrophotometric evidence for existence of [UO $_{2}$ (NO $_{3}$ ) $_{4}$ ] $^{2-}$

Sasaki, Kotoe*; Suzuki, Tomoya*; Arai, Tsuyoshi*; Takao, Koichiro*; Suzuki, Shinichi; Yaita, Tsuyoshi; Ikeda, Yasuhisa*

Chemistry Letters, 43(5), p.670 - 672, 2014/05

https://doi.org/10.1246/cl.131183

Times Cited Count：7 Percentile：25.99(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

X-ray structural analysis of molten PbCl

Okamoto, Yoshihiro; Iwadate, Yasuhiko*; Fukushima, Kazuko*; Matsuura, Haruaki*; Minato, Kazuo

Journal of Physics and Chemistry of Solids, 66(2-4), p.452 - 455, 2005/02

https://doi.org/10.1016/j.jpcs.2004.06.039

Times Cited Count：6 Percentile：30.12(Chemistry, Multidisciplinary)

The structure of molten PbCl was investigated by using X-ray diffrtaction(XRD) and X-ray absorption fine structure(XAFS) analysis techniques. From the fourier transformation analysis if the XRD data, the nearest Pb $^{2+}$ -Cl interaction consists of two kinds of interactions; rigid 4-fold tetrahedron and 2-3 loose coordination. The XAFS result shows a local structure is the 4-fold coordination in the melt.

Journal Articles

XAFS simulation of highly disordered materials

Okamoto, Yoshihiro

Nuclear Instruments and Methods in Physics Research A, 526(3), p.572 - 583, 2004/07

https://doi.org/10.1016/j.nima.2004.02.025

Times Cited Count：31 Percentile：86.68(Instruments & Instrumentation)

The XAFS functions for highly-disordered materials such as molten salts were simulated by using output data of molecular dynamics calculation. The atomic configuration data obtained from the MD results was directly used as input data in the XAFS simulation code FEFF8. It was assumed that Debye-Waller factor and anharmonic vibration effect could be substituted by an accumulation of the FEFF8 calculations using many atomic configurations. The experimental XAFS functions for platinum, solid and molten salt systems were nicely reproduced by the FEFF8 calculations with 10000-50000 atomic configurations.

Journal Articles

High-temperature XAFS study of solid and molten SrCl

Okamoto, Yoshihiro; Yaita, Tsuyoshi; Minato, Kazuo

Journal of Non-Crystalline Solids, 333(2), p.182 - 186, 2004/02

https://doi.org/10.1016/j.jnoncrysol.2003.09.059

Times Cited Count：11 Percentile：68.51(Materials Science, Ceramics)

The local structure of solid and molten SrCl was investigated by X-ray absorption fine structure(XAFS) technique. A superionic conduction state was observed below the melting point. The XAFS data at molten state was obtained at 1000 $^{circ}$ C. According to the curve fitting analysis, the nearest Sr $^{2+}$ -Cl distance and the coordination number are 2.99 and 6.6 in molten state. XAFS functions calculated from molecular dynamics simulation results were copmpared with the experimental XAFS data.

Journal Articles

In situ ATR-FTIR spectroscopy for functional groups of humic substances complexing with metal ions

Tanaka, Tadao; Sakamoto, Yoshiaki; Ogawa, Hiromichi

Genshiryoku Bakkuendo Kenkyu, 9(1), p.29 - 34, 2002/09

https://doi.org/10.3327/jnuce.9.29

To obtain structural information on functional groups of humic substances complexing with metal ions, infrared (IR) spectral analysis of the humic substances dissolving in aqueous solutions has been studied by ATR (Attenuated Total Reflection) method. By using the ATR method, IR spectral shifts of humic substance due to complexation with metal ions were observed. The observation provided with information on complexation kinetics, and on characteristics of functional groups depending on solvent properties, such as pH and solute concentrations. These information was difficult to be obtained by conventional FTIR spectroscopy using powdered humic substances. The obtained results show that IR spectral shifts on the functional groups of the humic substances complexed with metal ions could be possibly characterized by using the ATR-FTIR spectroscopy.

Journal Articles

Study of metallofullerenes encapsulating actinides

Akiyama, Kazuhiko; Sueki, Keisuke*; Tsukada, Kazuaki; Yaita, Tsuyoshi; Miyake, Yoko*; Haba, Hiromitsu*; Asai, Masato; Kodama, Takeshi*; Kikuchi, Koichi*; Otsuki, Tsutomu*; et al.

Journal of Nuclear and Radiochemical Sciences, 3(1), p.151 - 154, 2002/06

https://doi.org/10.14494/jnrs2000.3.151

The oxidation state of actinide elements encapsulated in fullerenes is studied. HPLC elution behavior of actinide-fullerenes is classified into two groups; the elution behavior of the first group, encapsulating U, Np, and Am, is similar to that of the light lanthanide-fullerenes, such as La, Ce, Pr, and Nd, while the behavior of the second group, encapsulating Th and Pa, is quite different from that of any lanthanide-fullerenes. The chemical species in the main HPLC elution peak of each group were identified as M@C82 and M@C84 (M = metal atom) from the mass of the U and Th fullerenes, respectively. The oxidation states of the U and Th atoms in the fullerenes were deduced to be 3+ and 4+, respectively, from the UV/vis/NIR absorption and XANES spectroscopy.

Journal Articles

Improved high-field laser characteristics of a diode-pumped Yb:LiYF $_{4}$ crystal at low temperature

Kawanaka, Junji; Yamakawa, Koichi; Nishioka, Hajime*; Ueda, Kenichi*

Optics Express (Internet), 10(10), p.455 - 460, 2002/05

https://doi.org/10.1364/OE.10.000455

Times Cited Count：48 Percentile：84.86(Optics)

no abstracts in English

Journal Articles

Degradation characteristics of humic acid during photo-Fenton processes

Fukushima, Masami*; Tatsumi, Kenji*; Nagao, Seiya

Environmental Science & Technology, 35(18), p.3683 - 3690, 2001/09

https://doi.org/10.1021/es0018825

Times Cited Count：135 Percentile：92.77(Engineering, Environmental)

no abstracts in English

Journal Articles

Orientation-selective excitation and dissociation in multilayer benzene

Sekiguchi, Tetsuhiro; Baba, Yuji; Sekiguchi, Hiromi*; Imamura, Motoyasu*; Matsubayashi, Nobuyuki*; Shimada, Hiromichi*

Applied Surface Science, 169-170(1-4), p.287 - 291, 2001/06

no abstracts in English

Journal Articles

First-principles calculations of Magnetic Circular Dichroism spectra of nonmagnetic elements in ferromagnetic ordered alloys

Yamaguchi, Masatake; Asano, S.*

Nihon Oyo Jiki Gakkai-Shi, 25(4-Part2), p.659 - 662, 2001/04

no abstracts in English

JAEA Reports

Measurement of neodymium(III) and samarium(III) by spectrophotometer and laser-induced photoacoustic spectroscopic system: A Preliminary study for speciation of aqueous Np(IV) species.

Kitamura, Akira; *

JNC TN8400 2001-009, 54 Pages, 2001/01

JNC-TN8400-2001-009.pdf:1.3MB

Spectroscopic measurements of neodymium(III) and samarium(III) were carried out by spectrophotometer and laser-induced photoacoustic spectroscopic (LPAS) system for the investigation of the detection limit of both systems. The absorption spectra and photoacoustic spectra of Nd $^{3+}$ and Sm $^{3+}$ were obtained with varying the concentration of the ions from 210 $^{-5}$ to 210 $^{-2}$ moldm $^{+3}$ . The absorption spectrum of Nd $^{3+}$ was also determined by a special spectrophotometer, of which the measurement cell was set in a glove box filled with inert nitrogen gas. For the comparison with these photoacoustic and absorption spectra, the absorption spectra of Nd $^{3+}$ and Sm $^{3+}$ were determined by an usual spectrophotometer with the light-path lengths of 1 cm and 10 cm. The detection limit of the photoacoustic measurement was reported much lower than that of absorbance measurement by several researchers. However, the present study was concluded that the detection limit of photoacoustic measurement with the present LPAS system was similar to that of absorbance measurement with the light-path length of 10 cm. The detection limits of neptunium(IV,V) were estimated and the possibility of the speciation of neptunium(IV) was discussed from the results of the present study.