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Kadowaki, Haruhiko; Kato, Atsushi; Tomioka, Osamu; Meguro, Yoshihiro; Takahashi, Kuniaki
no journal, ,
no abstracts in English
solutions using a newly developed on-line experimental systemTsukada, Kazuaki; Kasamatsu, Yoshitaka; Asai, Masato; Toyoshima, Atsushi; Ishii, Yasuo; Li, Z.; Kikuchi, Takahiro; Sato, Tetsuya; Nishinaka, Ichiro; Nagame, Yuichiro; et al.
no journal, ,
Anion-exchange chromatographic behavior of element 105, dubnium (Db), produced in the 
Cm(
F,5n)
Db reaction is investigated together with the homologues Nb and Ta in HF/HNO mixed media using a newly developed on-line experimental system. The result indicates that the adsorption sequence on the anion-exchange resin is Ta
Nb
Db, and the fluoride complex formation of Db is expected to be weaker than that of homologues.
Hosaka, Koichi; Itakura, Ryuji; Yokoyama, Keiichi; Yamanouchi, Kaoru*; Yokoyama, Atsushi
no journal, ,
In intense laser fields, molecules are decomposed into fragments through a number of competing dissociative ionization pathways. We investigate the dissociative ionization dynamics of ethanol in intense laser fields with photoelectron-photoion coincidence momentum imaging. The channel-specific photoelectron spectra reveal the electronic states prepared just after ionization, depending both on the decomposition pathways and on the temporal profile of laser pulses.
Yoshida, Masaru; Chen, J.; Asano, Masaharu; Maekawa, Yasunari
no journal, ,
no abstracts in English
Sato, Tetsuya; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Kasamatsu, Yoshitaka; Li, Z.; Ishii, Yasuo; Haba, Hiromitsu*; Goto, Shinichi*; Kudo, Hisaaki*; et al.
no journal, ,
To study chemical properties of transactinide element seaborgium (Sg, 
=106), we have developed an on-line isothermal gas chromatographic apparatus for the volatile oxychlorides. We examined the optimum conditions of the appratus using Mo and W as lighter homologues of Sg and studied gas chromatgraphic behaviour of them. It's found that the apparatus can be applied to Sg chemistry in gas phase.
Li, D.*; Chen, J.; Zhai, M.*; Asano, Masaharu; Maekawa, Yasunari; Oku, Hiroyuki*; Yoshida, Masaru
no journal, ,
no abstracts in English
Kurahashi, Kensuke; Tomioka, Osamu; Meguro, Yoshihiro; Takahashi, Kuniaki
no journal, ,
The solubilization of nitrate solution in supercritical CO by reverse micelle formation was investigated. After placing surfactant, alcohol and nitrate solution into a high-pressure cell, CO was introduced into the cell at high pressure. When the pressure was then raised above the cloud point pressure (CPP), the clear single phase was obtained. It means the nitrate solution was dissolved in supercritical CO. The effect of nitrate concentration on the CPP values was discussed.
Nagaishi, Ryuji; Aoyagi, Noboru; Shinha, Yusuke; Taguchi, Mitsumasa; Kondo, Takafumi*; Yang, J.*; Yoshida, Yoichi*
no journal, ,
Radiolytic reactions in ionic liquids of thiocyanate salts were studied by means of the nano-second pulse radiolysis technique. One of the significant ionization sites of liquids was found out to be thiocyanate ion by observing direct formation of its dimer radical anion, not via the diffusion reaction between thiocyanate radical and ion. The formation and reaction behaviors of solvated electron and dimer were examined by changing the composition of liquids and by adding electron scavengers to the liquid.
Kondo, Takafumi*; Yang, J.*; Yoshida, Yoichi*; Nagaishi, Ryuji; Taguchi, Mitsumasa; Takahashi, Kenji*; Kato, Ryuji*
no journal, ,
The effect of the coexistence water on the solvated electrons in ammonium ionic liquids was studied by the electron pulse radiolysis method. The optical absorption band of the solvation electron decreased by coexistence of water, and new absorption band like a hydrated electron were generated in the medium wavelength region between solvated electron and hydrated electron. Furthermore, if quantity of water increase in the hydrophilic ionic liquid, it was found that the spectrum changed into the hydrated electron.
Kumagai, Yuta; Nagaishi, Ryuji; Yamada, Reiji; Muroya, Yusa*; Katsumura, Yosuke
no journal, ,
Radiation-induced reductions in aqueous solutions are promoted by addition of ceramic oxide particles. To study the mechanism of this effect, kinetics of transient species produced by irradiation of a short pulse of electron beam were measured by time-resolved absorption spectroscopy. As a model of oxide particles nano-sized colloidal silica solutions were prepared by sol-gel method and used in irradiation experiments. The results showed that colloidal silica is reactive with OH radical and prevent oxidations by scavenging OH radical.
Yamashita, Shinichi; Katsumura, Yosuke; Maeyama, Takuya*; Lin, M.; Muroya, Yusa*; Murakami, Takeshi*; Meesungnoen, J.*; Jay-Gerin, J.-P.*
no journal, ,
It is phenomenologically well known that heavy-ion beams, which are known to be typical high-LET radiations, give distinctive irradiation effects compared to more popular low-LET radiations such as electron beam and 
-rays. Here, LET is abbreviation of linear energy transfer, defined as energy deposition from radiation to surrounding matter per unit length of its trajectory. Most of earlier studies focus lighter ions (
H, etc.) of lower energies (
10 MeV/nucleon). Moreover, knowledge under neutral pH, which is close to human body, has not been accumulated well. In this study, it is purposed to investigate chemical change occurring in neutral aqueous solutions after irradiation of high-energy (10-500 MeV/nucleon) heavy ions (
C, 
Fe, etc.). Especially, structure of heavy-ion track and radiation-chemical yields are discussed.
Muroya, Yusa*; Lin, M.; Han, Z.*; Fu, H.*; Yamashita, Shinichi; Sakumi, Akira*; Ueda, Toru*; Katsumura, Yosuke
no journal, ,
In order to investigate radiation-induced fast phenomena in solutions such as water and alcohols at extreme conditions (high temperature and pressure), a new high temperature-ultrafast pulse radiolysis system was developed, which was previously applicable only to the experiment at ambient condition. After the setup of the pulse radiolysis system a preliminary experiment, transient absorption spectroscopy of hydrated electron within a few nanosecond at elevated temperature from room temperature up to 300 
C, was performed.
Lin, M.; Katsumura, Yosuke; Muroya, Yusa*; Fu, H.*; Yamashita, Shinichi; Mostafavi, M.*; Lampre, I.*
no journal, ,
The molar extinction coefficients at the absorption maximum of the solvated electron spectrum have been re-evaluated to be 9 000, 9 700, 10 000 and 10 600 M
cm for 1,2-ethanediol (12ED), 1,2-propanediol (12PD), and 1,3-propanediol (13PD) and glycerol (GLY), respectively. These values are two-thirds or three-fourths of the value usually reported in the published report. With these extinction coefficients, the time-dependent radiolytic yields of the solvated electron in these diols from the ps to the 
s time range are described. The radiolytic yield in these viscous solvents is found to be strongly different from that of the aqueous solution. The temperature dependent absorption spectra of the solvated electron in 12ED, 12PD, 13PD, and GLY have also been investigated. In all these solvents, the optical spectra shift to the red with increasing temperature. The results, together with those of fs photochemistry studies carried out in Prof. Mostafavi's group, suggest that the solvation dynamics of electrons in these poly-ols is strongly related to the structure, especially the concentration of OH group.
Aoyagi, Noboru; Shinha, Yusuke; Shimojo, Kojiro; Naganawa, Hirochika; Izuoka, Akira*
no journal, ,
no abstracts in English
Shinha, Yusuke; Aoyagi, Noboru; Shimojo, Kojiro; Naganawa, Hirochika; Izuoka, Akira*
no journal, ,
no abstracts in English
Shimojo, Kojiro; Kurahashi, Kensuke; Naganawa, Hirochika
no journal, ,
no abstracts in English
Narita, Ayumi; Baba, Yuji; Sekiguchi, Tetsuhiro; Shimoyama, Iwao; Honda, Mitsunori; Hirao, Norie; Yaita, Tsuyoshi
no journal, ,
no abstracts in English
interface observed by micro-X-ray absorption spectroscopyHirao, Norie; Baba, Yuji; Sekiguchi, Tetsuhiro; Shimoyama, Iwao; Honda, Mitsunori; Narita, Ayumi
no journal, ,
no abstracts in English
Shimoyama, Iwao; Uddin, M. N.*; Baba, Yuji; Sekiguchi, Tetsuhiro; Nagano, Masamitsu*
no journal, ,
B-C-N hybrids have been expected to be used for an alternative catalysis for Pt. Since most products have complex structure including various unknown chemical bonding states, the local structures have not been clarified yet. In order to clarify the chemical bonding states of this material, we measured near-edge X-ray absorption fine structure (NEXAFS) of B-C-N hybrid thin films. B-C-N hybrid thin films were synthesized by ion beam deposition of borazine on a graphite substrate. Some 
* peaks were observed in B and N K-edge NEXAFS spectra, and these peaks showed different polarization dependences. This suggests that buckled structures were formed with graphite-like planner structures. Heat of formation is calculated for some model clusters which consist of a pentagon and hexagons, and compared with that for planner clusters with same compositions. From the comparison, we propose that substitution of B and N atoms for C atoms in graphite can induce fullerene-like structure.