Abstract
Abstract The reactions of 80Br and 82Br excited by the isomeric transition processes with CH4 have been compared with each other. Similar reaction processes; energetic and thermal ionic, are involved in both cases. However, the isotope effect appears in the energetic process to form CH3Br, but not in the thermal ionic process to form CH3Br and CH2Br2. The difference in the γ-transitions of 80mBr and 82mBr to the ground states is responsible for the above results. It is concluded that at least a part of the recoil Br atoms enter chemical combinations with surrounding molecules within 10−8sec, the life-time of the excited 80Br atom. Furthermore, the yield of CH380Br, lower than that of CH382Br, is discussed on the basis of the different kinetic energies achieved on the Br atoms.
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