Coincidence Moessbauer spectroscopic study of 57Co-labelled CoSeO4 and CoSeO4H2O.

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概要

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• KX-Ray-gated emission Mössbauer spectra and time-resolved emission Mössbauer spectra of <SUP>57</SUP>Co-labelled CoSeO<SUB>4</SUB> and CoSeO<SUB>4</SUB>·H<SUB>2</SUB>O were measured at room temperature using a coincidence technique. No difference in the area intensity ratio of <SUP>57</SUP>Fe(II) to the sum area intensity of <SUP>57</SUP>Fe(II) and <SUP>57</SUP>Fe(III) was observed for anhydrous CoSeO<SUB>4</SUB> between the KX-ray-gated and non-gated emission spectra; a larger area intensity of <SUP>57</SUP>Fe(II), however, was observed for the KX-ray-gated sectrum of CoSeO<SUB>4</SUB>·H<SUB>2</SUB>O than for the non-gated one. This difference is attributed to different local radiolytic effect of the deexcitation processes between KX-ray and Auger electron emission. The time-dependence in the area intensity ratio of <SUP>57</SUP>Fe(II) to the sum area intensity of <SUP>57</SUP>Fe(II) and <SUP>57</SUP>Fe(III) was observed for CoSeO<SUB>4</SUB>·H<SUB>2</SUB>O. The relaxation process observed for CoSeO<SUB>4</SUB>·H<SUB>2</SUB>O by its time-resolved spectrum indicates that the radicals formed in the EC-decay oxidize <SUP>57</SUP>Fe(II) on the time scale of the nuclear lifetime of the first excited state of <SUP>57</SUP>Fe, and that a radical reaction plays an important role in determining the relaxation time.

• 公益社団法人 日本化学会の論文

著者

• Endo Kazutoyo

  Department Of Physical Chemistry Showa Pharmaceutical University

• Nakada Masami

  Department Of Chemistry Japan Atomic Energy Research Institute

• Nakahara Hiromichi

  Department of Chemistry Faculty of Science The University of Tokyo

• Nakahara Hiromichi

  Department of Chemistry, Faculty of Science, Tokyo Metropolitan University

• Sano Hirotoshi

  Department of Chemistry Faculty of Science The University of Tokyo

• Nakada Masami

  Department of Chemistry, Faculty of Science, Tokyo Metropolitan University

• Watababe Yasuo

  Department of Chemistry, Faculty of Science, Tokyo Metropolitan University

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