Description:
<jats:title>Abstract</jats:title>
<jats:p>82Br obtained via the (I. T.) process has been reacted with methyl bromide. In the gaseous phase, only CH382Br and CH282BrBr are observed as major products, whereas in the solid phase other products, such as CH82BrBr2 and C2H582Br, have also been observed. Moderator experiments using He or Xe indicate that the formations of both CH382Br and CH282BrBr involve the reactions of the energetic 82Br atom. This is in great contrast to the early observations of the Br2-CH4 system, where the ionic as well as the energetic reactions of 82Br play a role in the formation of the C-82Br bond. Comparisons of these results with those found in the reactions of the 80Br obtained via the (n, γ) process suggest that the Br atom obtained via the (n, γ) process is more electronically excited than that from the (I. T.) process. The kinetic analysis of the present results gives the following relative α-values: αHe, 1.0; αXe, 8.8; αCH3Br, 10.3. It is suggested that, during the cooling-down process of 82Br, a high inelasticity is involved in the collision of 82Br, even with monatomic molecules.</jats:p>