Abstract
The chain radical reaction takes place if reactants are transformed through active intermediate species, viz., atoms and radicals, and reactions involving them form the closed cycle of transformations, and chain propagation occurs more rapidly than termination. The chain reaction is branched if it contains such a stage in which one radical or atom generates the formation of several atoms and radicals. As a result, under favorable conditions during the reaction the concentration of active centers increases and, correspondingly, the reaction rate increases. This often results in ignition or explosion. If branching occurs due to the interaction of an atom (radical) with a molecule, 3 particles with an unpaired electron (in the general case, 2n + 1) are formed from one particle owing to the conservation of the number of electrons in the system.
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