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Search Results: Records 1-20 displayed on this page of 37

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Journal Articles

Remote detection and identification of plastics with hyperspectral Raman imaging lidar

Somekawa, Toshihiro*; Kurahashi, Shinri*; Matsuda, Shohei; Yogo, Akifumi*; Kuze, Hiroaki*

Optics Letters, 50(1), p.57 - 60, 2025/01

https://doi.org/10.1364/OL.544096
 Times Cited Count：2 Percentile：56.39(Optics)

Journal Articles

None

Matsuda, Shohei; Yokoyama, Keiichi

Reza, Kurosu, (414), P. 4, 2024/04

no abstracts in English

Journal Articles

Photochemical separation of elements in high level radioactive liquid waste

Matsuda, Shohei; Yokoyama, Keiichi

Isotope News, (786), p.6 - 9, 2023/04

no abstracts in English

Journal Articles

Laser-fluence dependence of resonance-enhanced multiphoton reduction of trivalent europium

Matsuda, Shohei; Nakashima, Nobuaki*; Yokoyama, Keiichi; Taniguchi, Seiji*; Chosrowjan, H.*; Somekawa, Toshihiro*; Yatsuhashi, Tomoyuki*

Chemical Physics Letters, 802, p.139759_1 - 139759_6, 2022/09

https://doi.org/10.1016/j.cplett.2022.139759
 Times Cited Count：1 Percentile：4.43(Chemistry, Physical)

no abstracts in English

Journal Articles

Extended X-ray absorption fine structure spectroscopy measurements and ${it ab initio}$ molecular dynamics simulations reveal the hydration structure of the radium(II) ion

Yamaguchi, Akiko; Nagata, Kojiro*; Kobayashi, Keita; Tanaka, Kazuya; Kobayashi, Toru; Tanida, Hajime; Shimojo, Kojiro; Sekiguchi, Tetsuhiro; Kaneta, Yui; Matsuda, Shohei; et al.

iScience (Internet), 25(8), p.104763_1 - 104763_12, 2022/08

https://doi.org/10.1016/j.isci.2022.104763
 Times Cited Count：19 Percentile：64.20(Multidisciplinary Sciences)

no abstracts in English

Journal Articles

Marking actinides for separation; Resonance-enhanced multiphoton charge transfer in actinide complexes

Matsuda, Shohei; Yokoyama, Keiichi; Yaita, Tsuyoshi; Kobayashi, Toru; Kaneta, Yui; Simonnet, M.; Sekiguchi, Tetsuhiro; Honda, Mitsunori; Shimojo, Kojiro; Doi, Reisuke; et al.

Science Advances (Internet), 8(20), p.eabn1991_1 - eabn1991_11, 2022/05

https://doi.org/10.1126/sciadv.abn1991
 Times Cited Count：12 Percentile：47.22(Multidisciplinary Sciences)

no abstracts in English

Journal Articles

Investigation of hydration and adsorption structures on clay minerals of radium by EXAFS

Yamaguchi, Akiko; Nagata, Kojiro*; Tanaka, Kazuya; Kobayashi, Keita; Kobayashi, Toru; Shimojo, Kojiro; Tanida, Hajime; Sekiguchi, Tetsuhiro; Kaneta, Yui; Matsuda, Shohei; et al.

Hosha Kagaku, (45), p.28 - 30, 2022/03

no abstracts in English

Journal Articles

An Electron-capture efficiency in femtosecond filamentation

Nakashima, Nobuaki*; Yatsuhashi, Tomoyuki*; Sakota, Kenji*; Iwakura, Izumi*; Hashimoto, Sena*; Yokoyama, Keiichi; Matsuda, Shohei

Chemical Physics Letters, 752, p.137570_1 - 137570_5, 2020/08

https://doi.org/10.1016/j.cplett.2020.137570
 Times Cited Count：2 Percentile：7.03(Chemistry, Physical)

Photo-redox reactions between Eu$$^{3+}$$ and Eu$$^{2+}$$ ions are induced by laser irradiation in alcoholic solution. Efficiency, wavelength dependence, and laser-power dependence are investigated with three different lasers. Nano second laser pulses at a wavelength of 308 nm is found to cause one-photon redox reactions with a quantum yield around 0.5. Nano second laser pulses at a wavelength of 394 nm induces two-photon reduction of Eu$$^{3+}$$ to form Eu$$^{2+}$$. When the pulse energy is 5 mJ, the quantum yield is measured to be 0.015. Although the quantum yield is one order of magnitude lower than that of the one photon reduction, reduction phenomena can be easily observed under the moderate laser field strength. Because of the two-photon nature, there should be a room to improve the efficiency by increasing the laser field strength.

Journal Articles

Experimental determination of the photooxidation of aqueous I$$^{-}$$ as a source of atmospheric I$$_{2}$$

Watanabe, Kosuke*; Matsuda, Shohei; Cuevas, C. A.*; Saiz-Lopez, A.*; Yabushita, Akihiro*; Nakano, Yukio*

ACS Earth and Space Chemistry (Internet), 3(4), p.669 - 679, 2019/04

https://doi.org/10.1021/acsearthspacechem.9b00007
 Times Cited Count：15 Percentile：53.56(Chemistry, Multidisciplinary)

The photooxidation of aqueous iodide ions (I$$^{-}$$$$_{(aq)}$$) at sea surface results in the emission of gaseous iodine molecules (I$$_{2}$$$$_{(g)}$$) into the atmosphere. It plays a certain role in the transport of iodine from ocean to the atmosphere in the natural cycle of iodine. In this study, we determined the photooxidation parameters, the molar absorption coefficient ($$varepsilon$$$$_{iodide}$$($$lambda$$)) and the photooxidative quantum yields ($$Phi$$$$_{iodide}$$($$lambda$$)) of I$$^{-}$$$$_{(aq)}$$, in the range of 290-500 nm. Through the investigation of the influence of pH and dissolved oxygen (DO) on $$Phi$$$$_{iodide}$$($$lambda$$), the subsequent emission rates of I$$_{2}$$$$_{(g)}$$ following the photooxidation of I$$^{-}$$$$_{(aq)}$$ in deionized water solution (pH 5.6, DO 7.8 mg L$$^{-1}$$) and artificial seawater solution (pH 8.0, DO 7.0 mg L$$^{-1}$$) were estimated. A global chemistry-climate model employed herein to assess the I$$_{2}$$$$_{(g)}$$ ocean emission on a global scale indicated that the photooxidation of I$$^{-}$$$$_{(aq)}$$ by solar light can enhance the atmospheric iodine budget by up to $$sim$$8% over some oceanic regions.

Oral presentation

None

Matsuda, Shohei; Yokoyama, Keiichi; Kobayashi, Toru; Yaita, Tsuyoshi

no journal, , 

no abstracts in English

Oral presentation

None

Somekawa, Toshihiro*; Matsuda, Shohei; Kurahashi, Shinri*; Ishii, Moe*; Kuze, Hiroaki*; Shiina, Tatsuo*

no journal, , 

no abstracts in English

Oral presentation

None

Kobata, Masaaki; Kobayashi, Toru; Tanida, Hajime; Okamoto, Yoshihiro; Fukuda, Tatsuo; Tsuji, Takuya; Matsuda, Shohei; Kawasaki, Ikuto; Shibata, Goro; Doi, Reisuke; et al.

no journal, , 

no abstracts in English

Oral presentation

Photooxidation of trivalent americium in nitric acid

Matsuda, Shohei; Yokoyama, Keiichi; Yaita, Tsuyoshi; Kobayashi, Toru; Nakashima, Nobuaki*

no journal, , 

One of the spectroscopic properties for lanthanides and actinides is that they have f-f transitions in the visible region of their spectra. Those absorption appears at specific wavelength and has narrow line width even in the liquid phase owing to shielded f electrons. It has been reported that reduction reactions of Sm$$^{3+}$$, Eu$$^{3+}$$, and Yb$$^{3+}$$ are induced by multiphoton excitation through each f-f transition depending on conditions. This photochemical process may be applicable to mutual separation of f elements. In this study, we tried to optically control the oxidation state of americium. As a result, we found that trivalent americium (Am$$^{3+}$$) in nitric acid solution is oxidized to pentavalent one (AmO$$_{2}$$$$^{+}$$) during nanosecond pulsed-laser irradiation at 503 nm corresponding to the $$^{5}$$L$$_{6}$$ $$leftarrow$$ $$^{7}$$F$$_{0}$$ transition of Am$$^{3+}$$. Identification and quantification of the reactants and products were performed by absorption spectroscopy. Excitation wavelength dependence and fluence dependence of the oxidation suggest that it is initiated by a resonance-enhanced multiphoton process.

Oral presentation

Oxidation of trivalent americium in nitric acid induced by multiphoton excitation via an f-f transition

Matsuda, Shohei; Yokoyama, Keiichi; Yaita, Tsuyoshi; Kobayashi, Toru; Nakashima, Nobuaki*

no journal, , 

We have recently realized the oxidation of trivalent americium (Am$$^{III}$$) in nitric acid by multiphoton excitation via an f-f transition. In this study, an effect of nitrate ion (NO$$_{3}$$$$^{-}$$) on the Am$$^{III}$$ photooxidation have been investigated. Our results of NO$$_{3}$$$$^{-}$$ activity dependence of the Am$$^{III}$$ photooxidation and density functional theory calculation indicate that the complex of Am$$^{III}$$ with NO$$_{3}$$$$^{-}$$, in particular one-nitrate complex, contributes to it.

Oral presentation

None

Somekawa, Toshihiro*; Matsuda, Shohei; Kurahashi, Shinri*; Yogo, Akifumi*; Kuze, Hiroaki*

no journal, , 

no abstracts in English

Oral presentation

Measurement of nitrogen leakage by Raman lidar for observation inside the Fukushima No.1 reactor building

Ishii, Moe*; Somekawa, Toshihiro*; Kurahashi, Shinri*; Matsuda, Shohei; Kuze, Hiroaki*; Shiina, Tatsuo*

no journal, , 

Oral presentation

None

Somekawa, Toshihiro*; Matsuda, Shohei; Kurahashi, Shinri*; Yogo, Akifumi*; Kuze, Hiroaki*

no journal, , 

no abstracts in English

Oral presentation

None

Kobayashi, Toru; Kobata, Masaaki; Tanida, Hajime; Okamoto, Yoshihiro; Fukuda, Tatsuo; Tsuji, Takuya; Matsuda, Shohei; Kawasaki, Ikuto; Shibata, Goro; Doi, Reisuke; et al.

no journal, , 

no abstracts in English

Oral presentation

None

Kobayashi, Toru; Kobata, Masaaki; Tanida, Hajime; Okamoto, Yoshihiro; Fukuda, Tatsuo; Tsuji, Takuya; Matsuda, Shohei; Kawasaki, Ikuto; Shibata, Goro; Doi, Reisuke; et al.

no journal, , 

no abstracts in English

Oral presentation

None

Kobata, Masaaki; Kobayashi, Toru; Tanida, Hajime; Okamoto, Yoshihiro; Fukuda, Tatsuo; Tsuji, Takuya; Matsuda, Shohei; Kawasaki, Ikuto; Shibata, Goro; Doi, Reisuke; et al.

no journal, , 

no abstracts in English

37 (Records 1-20 displayed on this page)