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Dynamics of Unimolecular Reactions

  • Chapter
Dynamics of Molecular Collisions

Part of the book series: Modern Theoretical Chemistry ((MTC,volume 2))

Abstract

The subject of unimolecular dynamics deals with the intermolecular and intramolecular microscopic details of unimolecular reactions. Theories of unimolecular dynamics are concerned with molecular motion over potential energy surfaces and the behavior of molecular coordinates as a function of time. Most studies of unimolecular reactions have involved measurements and predictions of the rate at which an energized molecule will undergo a uni-molecular reaction. The basic postulate of all unimolecular theories is the rapidity of intramolecular vibrational energy relaxation. Experimentalists were awarded a rare opportunity to test two conflicting assumptions regarding this postulate by the simultaneous advent of the Slater(1) and Rice-Ramsperger-Kassel-Marcus (RRKM)(2) theories in the 1950s. Slater’s theory, which is dynamical, pictures a molecule as an assembly of harmonic oscillators. Within this framework vibrational energy relaxation between the normal modes is forbidden, and reaction occurs only when some coordinate, the reaction coordinate, reaches a critical extension by superposition of the various normal modes. In contrast, the RRKM theory, which is an extension by R. A. Marcus of the statistical theory developed by O. K. Rice, H. C. Ramsperger, and L. S. Kassel, assumes rapid relaxation of vibrational energy. The experimental tests overwhelmingly endorsed the RRKM theory, and the controversy involving intramolecular vibrational energy relaxation was seemingly laid to rest. It also appeared as though dynamical treatments of unimolecular reactions were unnecessary.

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  1. Department of Chemistry, Wayne State University, Detroit, Michigan, USA

    William L. Hase

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  1. University of California, Berkeley, USA

    William H. Miller

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Hase, W.L. (1976). Dynamics of Unimolecular Reactions. In: Miller, W.H. (eds) Dynamics of Molecular Collisions. Modern Theoretical Chemistry, vol 2. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-0644-4_3

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  • DOI: https://doi.org/10.1007/978-1-4757-0644-4_3

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