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Journal Articles

H atom, e $^{-}$ , and H $_6^{+}$ ions produced in irradiated solid hydrogens; An Electron spin resonance study

Kumada, Takayuki; Ushida, Takahiro*; Shimizu, Yuta*; Kumagai, Jun*

Radiation Physics and Chemistry, 77(10-12), p.1318 - 1322, 2008/10

https://doi.org/10.1016/j.radphyschem.2008.05.026

Times Cited Count：8 Percentile：49.01(Chemistry, Physical)

Very recently, we succeeded in observing totally more than 50 sharp ESR lines of H $_6^{+}$ and its isotope substituents H $_{5}$ D $^{+}$ , H $_{4}$ D $_2^{+}$ , and H $_{2}$ D $_4^{+}$ in -ray irradiated solid para-H $_{2}$ (p-H $_{2}$ ) and p-H $_{2}$ -D $_{2}$ and p-H $_{2}$ -HD mixtures. We also observed isotope-substitution reactions such as H $_6^{+}$ + HD H $_{5}$ D $^{+}$ + H $_{2}$ and H $_6^{+}$ + D $_{2}$ H $_{4}$ D $_2^{+}$ + H $_{2}$ . The H $_6^{+}$ ions diffuse in solid p-H $_{2}$ via the repetition of H $_6^{+}$ + H $_{2}$ H $_{2}$ + H $_6^{+}$ reactions which terminate by the H $_{6}$ $^{+}$ + HD or H $_6^{+}$ + D $_{2}$ reactions. The H $_{5}$ D $^{+}$ , H $_{4}$ D $_2^{+}$ , and H $_{2}$ D $_4^{+}$ ions, on the other hand, are immobile in solid p-H $_{2}$ . They decay via geminate recombination with trapped electrons within the time-scale of 5 hours.

Journal Articles

Electron spin resonance study on H, HD, HD, and HD in solid parahydrogen

Kumagai, Jun*; Inagaki, Hiroki*; Kariya, Susumu*; Ushida, Takahiro*; Shimizu, Yuta*; Kumada, Takayuki

Journal of Chemical Physics, 127(2), p.024505_1 - 024505_13, 2007/07

https://doi.org/10.1063/1.2748046

We carried out an electron spin resonance (ESR) study on hydrogen ion radicals produced by radiolysis of solid parahydrogen. We newly observed totally more than fifty resolved lines in irradiated solid parahydrogens. We assigned these lines to be isotope substituents of H-core H ions such as HD, HD, and HD throughout comparison of their ESR parameters with theoretical results. These results show conclusive evidence that H-core H ions are produced and stably trapped in irradiated solid hydrogens. We also observed a lowering symmetry on electron wave function in HD and HD, and isotope-substitution reactions such as H+DHD+H and H+HDHD+H.

Journal Articles

Electron spin resonance study on H $_{6}$ $^{+}$ , H $_{5}$ D $^{+}$ , H $_{4}$ D $_{2}$ $^{+}$ , and H $_{2}$ D $_{4}$ $^{+}$ in solid parahydrogen

Kumagai, Jun*; Inagaki, Hiroshi*; Kariya, Susumu*; Ushida, Takahiro*; Shimizu, Yuta*; Kumada, Takayuki

Journal of Chemical Physics, 127(2), p.024505_1 - 024505_13, 2007/07

https://doi.org/10.1063/1.2748046

Times Cited Count：17 Percentile：51.91(Chemistry, Physical)

We carried out an electron spin resonance (ESR) study on hydrogen ion radicals produced by radiolysis of solid parahydrogen. In addition to quartet ESR lines proposed to be H $_{2}$ $^{+}$ -core H $_{6}$ $^{+}$ ions in solid parahydrogen, we newly observed totally more than fifty resolved lines in -ray irradiated solid para-H $_{2}$ -ortho-D $_{2}$ (1 mol %) and para-H $_{2}$ -HD (1 mol %) mixtures. We assigned these lines to be isotope substituents of H $_{2}$ $^{+}$ -core H $_{6}$ $^{+}$ ions such as H $_{5}$ D $^{+}$ , H $_{4}$ D $_{2}$ $^{+}$ , and H $_{2}$ D $_{4}$ $^{+}$ throughout comparison of their ESR parameters with theoretical results.

Journal Articles

Interoperability establishment between two different GRIDs

Kushida, Noriyuki; Suzuki, Yoshio; Minami, Takahiro; Aoyagi, Tetsuo; Nakajima, Norihiro

Zen NEC C&C Shisutemu Yuzakai Heisei-19-Nendo Rombunshu (CD-ROM), 10 Pages, 2007/00

Interoperability establishment between two different GRIDs.

Oral presentation

Concept of a quake-proof information control and management system for nuclear power plant, 1; Construction of Atomic Energy Grid InfraStructure (AEGIS)

Suzuki, Yoshio; Kushida, Noriyuki; Yamagishi, Nobuhiro; Minami, Takahiro; Matsumoto, Nobuko; Nakajima, Kohei; Nishida, Akemi; Matsubara, Hitoshi; Tian, R.; Hazama, Osamu; et al.

no journal, ,

no abstracts in English

Oral presentation

Interoperability establishment between UNICORE and ITBL

Kushida, Noriyuki; Suzuki, Yoshio; Minami, Takahiro; Tani, Masayuki; Nakajima, Norihiro; Keller, R.*; Beisel, T.*

no journal, ,

no abstracts in English

Oral presentation

Application of Atomic Energy Grid InfraStructure (AEGIS) to nuclear fusion research

Suzuki, Yoshio; Kushida, Noriyuki; Yamagishi, Nobuhiro; Nakajima, Kohei; Minami, Takahiro; Matsumoto, Nobuko; Aoyagi, Tetsuo; Nakajima, Norihiro; Iba, Katsuyuki*; Hayashi, Nobuhiko; et al.

no journal, ,

no abstracts in English

Oral presentation

H $_{6}$ $^{+}$ , H $_{5}$ D $^{+}$ , H $_{4}$ D $_{2}$ $^{+}$ , and H $_{2}$ D $_{4}$ $^{+}$ produced in -ray irradiated solid para-H $_{2}$

Kumada, Takayuki; Kumagai, Jun*; Ushida, Takahiro*; Shimizu, Yuta*

no journal, ,

We carried out electron spin resonance (ESR) study of irradiated solid para-H $_{2}$ . H $_{6}$ $^{+}$ lines were observed. The H $_{6}$ $^{+}$ ion is the ionic hydrogen radical whose spectrum is firstly observed in irradiated solid para-H $_{2}$ . The H $_{6}$ $^{+}$ ions diffuse in solid H $_{2}$ via the repetition of H $_{6}$ $^{+}$ + H $_{2}$ H $_{2}$ + H $_{6}$ $^{+}$ reaction, which terminate by the isotope-exchange reaction H $_{6}$ $^{+}$ + HD H $_{5}$ D $^{+}$ + H $_{2}$ or H $_{6}$ $^{+}$ + D $_{2}$ H $_{4}$ D $_{2}$ $^{+}$ + H $_{2}$ . Unlike H $_{6}$ $^{+}$ , the isotope substitutions H $_{5}$ D $^{+}$ and H $_{4}$ D $_{2}$ $^{+}$ cannot diffuse in solid para-H $_{2}$ . Rate-determining step of their decay is charge recombination with e $^{-}$ .