Isomeric transition-activated 80Br and 82Br reactions in the gaseous CH3Br-HBr system.

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概要

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• The isomeric transition(IT)-activated <SUP>80</SUP>Br and <SUP>82</SUP>Br reactions in the gaseous H<SUP>80m</SUP>Br–CH<SUB>3</SUB>Br and H<SUP>82m</SUP>Br–CH<SUB>3</SUB>Br systems have been compared and the roles of the charge and kinetic energy imparted to <SUP>80</SUP>Br and <SUP>82</SUP>Br in recombina tion reactions studied using a Kr moderator. The products CH<SUB>3</SUB>Br, CH<SUB>2</SUB>Br<SUB>2</SUB>, CHBr<SUB>3</SUB>, and CH<SUB>3</SUB>CH<SUB>2</SUB>Br in both reactions are only formed <I>via</I> thermal ionic processes. This differs from the <SUP>82m</SUP>BrBr–CH<SUB>3</SUB>Br system, in which the reaction products are only formed through excess kinetic energy processes. The difference between the two reactions has been explained on the basis of the cross sections for charge neutralization and ion molecule reactions of Br<SUP>+</SUP> ions as a function of the kinetic energy initially imparted to the <SUP>80</SUP>Br or <SUP>82</SUP>Br atoms. An isotope effect has been observed between the IT-activated <SUP>80</SUP>Br and <SUP>82</SUP>Br reactions with CH<SUB>3</SUB>Br, and attributed to the difference in the decay modes of <SUP>80m</SUP>Br and <SUP>82m</SUP>Br. Furthermore, the analysis of product yields due to the successive internal conversion process in <SUP>80m</SUP>Br suggested that the second Auger process from the excited <SUP>80</SUP>Br occurs in a liquid-like condition such as ion-clusters.

• 公益社団法人 日本化学会の論文

著者

• Kondo Kenjiro

  Laboratory of Nuclear Science, Tohoku University

• Yagi Masuo

  Laboratory of Nuclear Science, Faculty of Science, Tohoku University

関連論文

• Specific Features of Tohoku Charge Spectrometer
• The Effect of the Krypton Moderator on the Isomeric Transitioninduced Reactions of 80Br with CH4
• Isomeric transition-activated 80Br and 82Br reactions in the gaseous CH3Br-HBr system.
• Reactions of isomeric transition-activated 80Br in the H80mBr-CH4 system.
• Isotope effect in thermal ionic reactions of isomeric transition-activated 80Br and 82Br in the HBr-CH4 system.
• Effect of inorganic additives on the reactions of isomeric transition-activated 80Br and 82Br in the gaseous HBr-CH4 system.

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