ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Theoretical arguments and Monte Carlo results show that under certain circumstances, obstruction may increase the reaction rate of a binary reaction A+B→products. Near the percolation threshold, anomalous subdiffusion slows the initial encounter of the reactants, but it also slows the separation of the reactants after an unsuccessful collision. In a finite system, if the reaction probability P per collision is small enough, the recollision effect predominates and the reaction rate is enhanced slightly. As a result of this effect, as P is varied, the range of reaction rates on a percolation cluster is much smaller than the range for an unobstructed system. Furthermore, there is a crossover reaction probability PCR at which the reaction rate becomes practically independent of obstacle concentration for the entire range from the unobstructed system to the percolation threshold. © 2002 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1424317
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