An Additional Formation of CH<SUB>2</SUB><SUP>80</SUP>BrBr <I>via</I> a Kinetic-energy-independent Process in the Highly Moderated <SUP>80<I>m</I></SUP>Br-CH<SUB>4</SUB> Systems

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概要

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• The moderator effect of Kr on the reaction of (I.T.)-activated <SUP>80</SUP>Br with CH<SUB>4</SUB> has been examined, keeping the ratio of Br<SUB>2</SUB>/CH<SUB>4</SUB> at 0.02 or 0.05. The yield of CH<SUB>2</SUB><SUP>80</SUP>BrBr shows a slight decrease at the beginning of moderation and then tends to increase with further moderation. These facts suggest an additional formation of CH<SUB>2</SUB>-<SUP>80</SUP>BrBr <I>via</I> a thermal ionic process in highly-moderated systems. When the concentration of Br<SUB>2</SUB> is varied in the system containing 10 cmHg of CH<SUB>4</SUB> and from 40 to 36 cmHg of Kr, the yield of CH<SUB>2</SUB><SUP>80</SUP>BrBr first increases and then decreases, showing a broad maximum. This dependence not only partly explains the inconsistence of the present results with those previously reported, but also suggests the competition of two types of reaction in its formation. One must be the reaction of a radioactive radical with Br<SUB>2</SUB>, leading to the formation of CH<SUB>2</SUB><SUP>80</SUP>BrBr:<BR>·CH<SUB>2</SUB><SUP>80</SUP>Br+Br<SUB>2</SUB>→CH<SUB>2</SUB><SUP>80</SUP>BrBr.<BR>The other type of reaction is a scavenging reaction of Br<SUB>2</SUB> for the reacting <SUP>80</SUP>Br atom.

• 公益社団法人 日本化学会の論文

著者

• Tachikawa Enzo

  Division of Radiation Applications Japan Atomic Energy Research Institute

• Saeki Masakatsu

  Division of Chemistry, Japan Atomic Energy Research Institute

• Numakura Kenshi

  Division of Chemistry, Japan Atomic Energy Research Institute

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