Sum over
Histories Representation for Chemical Kinetics
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Abstract
A new
representation for chemical kinetics is introduced that is
based on a sum over histories formulation that employs chemical pathways
defined at a molecular level. The time evolution of a chemically reactive
system is described by enumerating the most important pathways followed
by a chemical moiety. An explicit formula for the pathway probabilities
is derived and takes the form of an integral over a time-ordered product.
When evaluating long pathways, the time-ordered product has a simple
Monte Carlo representation that is computationally efficient. A small
numerical stochastic simulation was used to identify the most important
paths to include in the representation. The method was applied to
a realistic H<sub>2</sub>/O<sub>2</sub> combustion problem and is
shown to yield accurate results