## Wikipedia - RRKM理論 Rice–Ramsperger–Kassel–Marcus (RRKM) theory

https://doi.org/10.1351/goldbook.R05391
An improved form of @R05390@ in which account is taken of the way in which the various normal-@M03958@ vibrations and rotations contribute to reaction, and allowance is made for the zero-point energies. In this theory the energy $$\varepsilon^{\text{*}}$$ in an energized molecule is classified as either active, $$\varepsilon^{\text{*active}}$$, or inactive, $$\varepsilon^{\text{*inactive}}$$. The rate depends upon $$\frac{P(\varepsilon^{\text{*active}})}{N(\varepsilon^{\text{*}})}$$, where $$N(\varepsilon^{\text{*}})$$ is the density of states having energy between $$\varepsilon^{\text{*}}$$ and $$\varepsilon^{\text{*}}+\text{d}\varepsilon^{\text{*}}$$, and $$P(\varepsilon^{\text{*active}})$$ is the sum of the active quantum states of the @A00092@. This extension of RRK theory brings it in line with @T06470@.
Source:
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 186 [Terms] [Paper]