Nonclassical kinetics of an elementary A+B-->C reaction-diffusion system showing effects of a speckled initial reactant distribution and eventual self-segregation: experiments.

Journal Article (Journal Article)

We demonstrate here the implementation of an experimental system suitable for the study of the diffusion limited A+B-->0, nonclassical reaction behavior. Using a combination of a fluorescent calcium indicator and a calcium ion which is initially "caged," a pulse of near-UV light initiates the reaction which is followed as product formation vs time. Sensitive dependence on the initial reactant distribution is observed through patterns in the uncaging UV light profile. In one case, the reaction progress passes through two nonclassical time regimes, one due to roughness originating from laser speckles, followed by one consistent with the three-dimensional Zeldovich rate of (1/rho(A)-1/rho(A0)) approximately t(3/4), with features matching Monte Carlo simulations on this initial distribution. This behavior is contrasted with reactions initiated by a homogeneous source which induces random initial reactant distributions, though both systems seem to approach the asymptotic limit of self-segregation of reactants.

Full Text

Duke Authors

Cited Authors

  • Monson, E; Kopelman, R

Published Date

  • February 2004

Published In

Volume / Issue

  • 69 / 2 Pt 1

Start / End Page

  • 021103 -

PubMed ID

  • 14995423

Electronic International Standard Serial Number (EISSN)

  • 1550-2376

International Standard Serial Number (ISSN)

  • 1539-3755

Digital Object Identifier (DOI)

  • 10.1103/physreve.69.021103


  • eng