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Global dynamics and transition state theories: Comparative study of reaction rate constants for gas‐phase chemical reactions
Author(s) -
Ju LiPing,
Han KeLi,
Zhang John Z. H.
Publication year - 2008
Publication title -
journal of computational chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.907
H-Index - 188
eISSN - 1096-987X
pISSN - 0192-8651
DOI - 10.1002/jcc.21032
Subject(s) - transition state theory , reaction rate constant , gas phase , chemistry , degrees of freedom (physics and chemistry) , thermodynamics , density functional theory , statistical physics , transition state , quantum , range (aeronautics) , state (computer science) , computational chemistry , physics , quantum mechanics , materials science , mathematics , kinetics , biochemistry , algorithm , composite material , catalysis
In this review article, we present a systematic comparison of the theoretical rate constants for a range of bimolecular reactions that are calculated by using three different classes of theoretical methods: quantum dynamics (QD), quasi‐classical trajectory (QCT), and transition state theory (TST) approaches. The study shows that the difference of rate constants between TST results and those of the global dynamics methods (QD and QCT) are seen to be related to a number of factors including the number of degrees‐of‐freedom (DOF), the density of states at transition state (TS), etc. For reactions with more DOF and higher density of states at the TS, it is found that the rate constants from TST calculations are systematically higher than those obtained from global dynamics calculations, indicating large recrossing effect for these systems. The physical insight of this phenomenon is elucidated in the present review. © 2008 Wiley Periodicals, Inc. J Comput Chem, 2009