反跳インプランテーションによるテクネチウムなどの新物質の合成とその生成機構

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  • Synthesis of new chemical compounds recoil implantation and its reaction mechanisms.
  • ハンチョウ インプランテーション ニ ヨル テクネチウム ナド ノ シン ブッ

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説明

Recoil implantation has been applied to synthesis of new chemical substances which, are not easily obtained by ordinary chemical procedures. The mechanisms of chemical reactions induced by recoil implantation are interesting because they can elucidate the related reactions in hot atom chemistry.<BR>In this paper the recoil implantation reactions of Cr in R-diketonates mixed systerns such as [Fe(acac)3]-[Fe(dprr)3], [Cr(acac)3]-[Fe(dpm)3] and [Ci-(dpm)8]-[Fe(acac)3] were investigated. The source powders were irradiated with reactor neutrons, with r-rays of an electron linear accelerator, and with deutrons in a cyclotron, ana Cr recoil atoms produced by (n, r), and (d, xn) reactions were implanted in the catcher of diketonate mixed systems.<BR>Implantation of "Cr by cyclotron irradiation in [Fe(acac)3]-[Fe(dpm)3] gave chemical species [51Cr(acac)x(dpm)3, ] where x-=0-3. The recoil replacement reaction type species [Cr(dpm)3] and [Cr(acac)3] were found more important than the abstraction type species [Cr. (acac)(dpiri)2] and [Cr(acat)2(dpin)] on the contrary of ROssler's observation on rhenium compounds. Moreover, the ratio [51Cr(dpm)3]/[51Cr(acac)3] was much larger than, unity when [Fe(dpm), ]/[Fe(acac)a] was unity, and it depended apparently on recoil energy. Observation of (n, r) and (r, n) reactions of chromium in the mixture systems [Cr(acac)3]- [Fe(dpm), ] and [Cr(dpm)3]-[Fe(acac)3] led us to the conclusion that there were threshold values of energy for formation of recoil replacement reaction type compounds.

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