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Itakura, Ryuji; Hasegawa, Hirokazu*; Kurosaki, Yuzuru; Yokoyama, Atsushi; Oshima, Yasuhiro*
no journal, ,
Molecules in intense laser fields are rotationally excited through the non-adiabatic interaction between the induced dipole moment and the laser field. As the intensity of the laser fields increases, the ionization proceeds significantly. In this study, we observed the rotational state distribution of NO irradiated with intense laser pulses using a spectroscopic approach. We also calculated a time-dependent Schrodinger equation for the rotational excitation taking into account of the ionization.
Nagaishi, Ryuji; Aoyagi, Noboru; Taguchi, Mitsumasa; Kondo, Takafumi*; Yang, J.*; Yoshida, Yoichi*
no journal, ,
Reaction behaviors of radiolysis products in mixtures of different ionic liquids containing thiocyanate anion were studied by measuring the transient absorptions under irradiation of electron pulses. Dimer radical ion of thiocyanate in the visible range and electron in the near-infrared range were observed in the ns-pulse radiolysis to measure their yields and reactions. The formations of products increased with increasing the thiocyanate concentration, regardless of kinds of cations in the mixture. The products were also observed in the ps-pulse radiolysis to clarify their formation pathways.
Ninomiya, Kazuhiko; Nagatomo, Takashi*; Kubo, Kenya*; Kita, Makoto*; Shinohara, Atsushi*; Ito, Takashi; Strasser, P.*; Kawamura, Naritoshi*; Shimomura, Koichiro*; Miyake, Yasuhiro*; et al.
no journal, ,
It is expected that muon irradiation and muonic X-ray detection emitted after formation of muonic atom can be applied to non-destructive elemental analysis. In this study, we performed muon irradiation for old Chinese bronze coin at MUSE in J-PARC and determined contents of this sample.
-ray and pulsed electron radiolysis studies on the reaction of solvated electrons in room temperature ionic liquids of alkylammonium saltsKimura, Atsushi; Taguchi, Mitsumasa; Kondo, Takafumi*; Yang, J.*; Yoshida, Yoichi*; Hirota, Koichi
no journal, ,
no abstracts in English
Tamada, Masao
no journal, ,
Infinite resource of uranium is dissolved in seawater. This uranium resource can be collected with fibrous amidoxime adsorbent synthesized by radiation-induced graft polymerization. Marine experiment using the fibrous adsorbent revealed that 1 kg of uranium could be collected successfully as a yellow cake. A new braid type adsorbent, which can stand vertically on the bottom of the sea, has been developed to achieve the practical cost of uranium collection from seawater. When the braid type is utilized 18 times, the collection cost reaches 25 thousand yen/kg-U at yearly collection scale of 1200 t-U.
Toyoshima, Atsushi; Tsukada, Kazuaki; Asai, Masato; Sato, Tetsuya; Li, Z.; Sato, Nozomi; Kikuchi, Takahiro; Kitatsuji, Yoshihiro; Nagame, Yuichiro; Oe, Kazuhiro*; et al.
no journal, ,
Reduction of mendelevium (Md) was studied by an electrochemical method on a single atom scale. Mendelevium-255 produced in the 
Cm(
B,4n) reaction at the JAEA tandem accelerator was transported to a chemistry laboratory by a gas-jet method. The Md isotope was then dissolved with 0.1 M HCl and fed into a working electrode modified with cation-exchange resin of a flow electrolytic column apparatus. The elution behavior on the electrode was examined as a function of the applied potential. It was found that trivalent ion of Md is reduced to the divalent state at the potentials below -0.4 V vs. an Ag/AgCl reference electrode.
Chen, J.; Asano, Masaharu; Maekawa, Yasunari
no journal, ,
To prepare a high performance catalyst layer with low platinum nano-particles loading, radiation-induced reduction of Pt ions in a mixture of carbon black and water solution was carried out. Furthermore, the fuel cell performance of the catalyst layer prepared by the different conditions was investigated in detail.
Mannan, M. A.; Baba, Yuji; Sekiguchi, Tetsuhiro; Shimoyama, Iwao; Hirao, Norie; Narita, Ayumi; Nagano, Masamitsu*; Noguchi, Hideyuki*
no journal, ,
no abstracts in English
Shimojo, Kojiro; Mitamura, Hisayoshi; Naganawa, Hirochika
no journal, ,
no abstracts in English
and Br
in aqueous solutionsLin, M.; Katsumura, Yosuke; Muroya, Yusa*; Fu, H.*; Yan, Y.*; Yamashita, Shinichi; Mostafavi, M.*
no journal, ,
The absorption spectra of Br and Br in aqueous solutions are investigated by pulse radiolysis techniques from room temperature to 380 and 350 
C, respectively. Temperature dependent spectrum of Br is also measured under steady-sate. If the absorption of Br is of Charge Transfer To Solvent (CTTS), those of Br and Br are not.
Kumagai, Yuta; Nagaishi, Ryuji; Yamada, Reiji; Muroya, Yusa*; Katsumura, Yosuke*
no journal, ,
Reactions of the radiolytic products of water in aqueous solution of colloidal silica have been studied by pulse-radiolysis technique in order to understand the effect of interface between ceramic oxides and water on radiation-induced reactions in aqueous solution, which is important in connection with the radiation effect on groundwater in the geological disposal of high-level radioactive waste. Time-resolved measurement on the reaction of OH radical with ferrocyanide ion in the presence of colloidal silica indicates that the colloidal silica reacts with OH radical in competition with ferrocyanide ion. The measured reactivity of colloidal silica toward OH radical was approximately proportional to its surface area and also depended on the pH of aqueous solution.
Muroya, Yusa*; Lin, M.; Han, Z.*; Yamashita, Shinichi; Ueda, Toru*; Hatano, Yoshihiko; Mostafavi, M.*; Katsumura, Yosuke
no journal, ,
By using a laser-driven S-band linear accelerator and a femtosecond laser, a new highly time-resolved pulse radiolysis system was developed for investigating radiation-induced fast phenomena in high temperature / high pressure water. Transient absorption spectra and fast kinetics of hydrated electron within several nanoseconds at elevated temperatures from room temperature up to supercritical state (400C, 40 MPa) have been measured.
Peng, J.; Wan, L. K.*; Lin, M.; Yan, Y.*; Muroya, Yusa*; Katsumura, Yosuke
no journal, ,
Nb
O
nanosheetsYamaguchi, Daisuke; Miyamoto, Nobuyoshi*; Fujita, Takako*; Nakato, Teruyuki*; Koizumi, Satoshi; Yagi, Naoto*; Ota, Noboru*; Hashimoto, Takeji
no journal, ,
Formation of lyotropic liquid crystalline (LC) phase was observed on a charged colloidal platelike particle system yielded from layered niobate crystal of KNbO. Firstly, the effect of mean lateral size (D) of the particle was examined at a constant volume fraction of the particle (.fai.) where a LC phase coexisted with an isotropic (I) phase. The coexisting LC phase was distinctly transformed from nematic to lamellar (L) as D was diminished. Secondly, the .fai. dependence of the interparticle distance (d) was examined along the I-L transition. In the coexistence region, d varied with .fai. and held nearly the same value between I and L phases, apparently deviating from gas-liquid condensation-type phase separation.