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Experimental Chemical Kinetics of an A+B→0 System Showing Non-Classical Effects of Initial Reactant Distribution

Published online by Cambridge University Press:  10 February 2011

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

We demonstrate here the implementation of an experimental system suitable for the study of the diffusion-limited A+B→0, non-classical 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. The reaction progress passes through two non-classical time regimes, one due to roughness originating from laser speckles, followed by one exhibiting the three-dimensional Zeldovich rate of (1/ρA − 1/ρA0) ˜ t3/4, with features matching Monte Carlo simulations on this initial distribution.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 543: Symposium W – Dynamics in Small Confining Systems IV , 1998 , 255
Copyright
Copyright © Materials Research Society 1999

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