## Abstract

The intramolecular dynamics of Cl^{-}- - -CH_{3}Br complexes is studied at an energy approximately equal to the average thermal energy of complexes formed by Cl^{-} + CH_{3}Br association at 300 K. Lyapunov exponents are calculated for different mode excitations of the Cl^{-}- - -CH_{3}Br complex. Without zero-point energy added to the complex, a number of the mode excitations have zero Lyapunov exponents and, thus, regular motion. The Lyapunov exponents are positive and the motion is chaotic for all mode excitations with zero-point energy added. However, the latter Lyapunov exponents are sufficiently small that the time required to form a microcanonical ensemble of Cl^{-}- - -CH_{3}Br states is much longer than the RRKM lifetime of the complex. Thus, non-RRKM unimolecular dynamics is expected for the Cl^{-}- - -CH_{3}Br complex as found in previous trajectory simulations.

Original language | English |
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Pages (from-to) | 573-585 |

Number of pages | 13 |

Journal | International Journal of Mass Spectrometry and Ion Processes |

Volume | 167-168 |

DOIs | |

State | Published - 1997 |

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