## Abstract

Microcanonical variational theory with a semiclassical adiabatic ground-state transmission coefficient predicts the thermal rate constant for collinear H + Cl_{2} within 6% for 200-1000 K and the kinetic isotope effect k_{H}/k_{D} within 6 or 9% (depending on the detailed assumptions in the transmission coefficient) over the same temperature range. Other versions of variational transition-state theory and even conventional transition-state theory with semiclassical or quantum mechanical adiabatic ground-state transmission coefficients are also tested and show similar accuracy. The variational calculations predict a greater breakdown of conventional transition-state theory at higher temperatures and for three-dimensional reactions. The unified statistical theory is less accurate than variational transition-state theory for the magnitudes of the collinear rate constants, but more accurate for collinear kinetic isotope effects.

Original language | English (US) |
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Pages (from-to) | 1749-1752 |

Number of pages | 4 |

Journal | Journal of physical chemistry |

Volume | 84 |

Issue number | 13 |

State | Published - Dec 1 1980 |

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