We used a genetic algorithm to fit a set of energy differences obtained by neglect-of-diatomic-differential-overlap (NDDO) molecular orbital theory to reference ab initio data, yielding a set of specific reaction parameters (SRP) for the reaction CI + CH 4. Only a small number ab initio points along
Exploring potential energy surfaces for chemical reactions: An overview of some practical methods
β Scribed by H. Bernhard Schlegel
- Publisher
- John Wiley and Sons
- Year
- 2003
- Tongue
- English
- Weight
- 390 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0192-8651
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β¦ Synopsis
Abstract
Potential energy surfaces form a central concept in the application of electronic structure methods to the study of molecular structures, properties, and reactivities. Recent advances in tools for exploring potential energy surfaces are surveyed. Methods for geometry optimization of equilibrium structures, searching for transition states, following reaction paths and ab initio molecular dynamics are discussed. For geometry optimization, topics include methods for large molecules, QM/MM calculations, and simultaneous optimization of the wave function and the geometry. Path optimization methods and dynamics based techniques for transition state searching and reaction path following are outlined. Developments in the calculation of ab initio classical trajectories in the BornβOppenheimer and CarβParrinello approaches are described. Β© 2003 Wiley Periodicals, Inc. J Comput Chem 24: 1514β1527, 2003
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## Abstract We describe the implementation of an adaptive umbrella sampling method, making use of the weighted histogram analysis method, for computing multidimensional potential of mean force for chemical reaction in solution. The approach is illustrated by investigating the effect of aqueous solu