Chemical Kinetics of Atomic Bromine from Nuclear Isomeric Transition

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Abstract
Chemical evidence indicates that the nuclear isomeric transition of Br80 is completely converted. Although isomeric transition always produces C–Br bond rupture in CH3Br(g) it often fails to rupture HBr(g). Other results are consistent with the interpretation that daughter Br80 particles, following bond rupture, usually become free, thermal atoms. Their kinetic behavior with C2H4–HBr mixtures corresponds to the analogous Br79(n, γ)Br80 kinetics (R. R. Williams and W. H. Hamill, J. Chem. Phys. 18, 783 (1950)). Using daughter Br80 it is shown that bromine addition at the C=C double bond does not involve the Br3 complex. The HBr82–Br2 exchange was found to be complete in two minutes.

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