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The Anomalous Diffusion-limited Reaction Kinetics of a Phototrapping Reaction

Published online by Cambridge University Press:  10 February 2011

Eric Monson ,
Anna L. Lin  and
Raoul Kopelman
Eric Monson
Affiliation:
Applied Physics Program, University of Michigan, Ann Arbor, Michigan 48019–1055
Anna L. Lin
Affiliation:
Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109–1055
Raoul Kopelman
Affiliation:
Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109–1055 Applied Physics Program, University of Michigan, Ann Arbor, Michigan 48019–1055
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Abstract

A focused laser beam acts as both a “phototrap”, bleaching fluorophore molecules which diffuse into the beam path, and as a confocal probe, detecting the excited, unbleached fluorophore molecules still present in the trap. With this focused laser beam, we observe anomalous asymptotic rate laws similar to those predicted for a diffusion-controlled elementary trapping reaction, A + T → T, in one and two dimensions. One dimensional diffusion-limited trapping kinetics are approached in capillaries with 10 μm diameters while two dimensional diffusion limited trapping kinetics are observed with unstirred samples having a quasi 2-D geometry. In the presence of stirring, the 2-D samplesexhibit the classical, constant trapping rate over time.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 464: Symposium FF – Dynamics in Small Confining Systems III , 1996 , 257
Copyright
Copyright © Materials Research Society 1997

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References

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