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Observation of Laser Speckle Effects in an Elementary Chemical Reaction

Published online by Cambridge University Press:  21 March 2011

Eric Monson  and
Raoul Kopelman
Eric Monson
Affiliation:
University of Michigan Departments of Chemistry and Applied Physics Ann Arbor, MI 48109-1055, USA
Raoul Kopelman
Affiliation:
University of Michigan Departments of Chemistry and Applied Physics Ann Arbor, MI 48109-1055, USA
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Abstract

An experimental demonstration is shown for non-classical reaction kinetics in a homogeneous system with an elementary reaction, A+B→C. Sensitivity to the initial distribution of reactants is observed, along with a new reaction-kinetics regime which is a direct consequence of speckles in the laser beam. The long-time regime gives the first experimental demonstration of the asymptotic self-segregation (“Zeldovich”) effect, in spite of the non-random, speckled initial distribution of reactant B. Monte-Carlo simulation results are consistent with the experiments, and spatial analysis of these results correlates the excess of long-wavelength components in the initial reactant distribution with an anomalous slowing of the reaction progress.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 651: Symposium T – Dynamics in Small Confining Systems V , 2000 , T6.2.1
Copyright
Copyright © Materials Research Society 2001

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