monomolecular reaction

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mon·o·mo·lec·u·lar re·ac·tion

a reaction involving a single molecule (for example, decomposition, intramolecular rearrangement, intramolecular oxidation or reduction), even if a catalytic agent, such as acid or alkali, is present in large excess, on a molecular basis, or is not rate-determining; such reactions are usually first-order reactions. Compare: molecularity.
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TO] are the Boltzmann constant, Planck constant, and total concentration of reactive sites (which should be left out in the case of monomolecular reactions, i.