J. Phys. Chem., 100 (49), 18992 -18996 jp961392s S0022-3654(96)01392-5

Copyright © 1996 by the American Chemical Society

Light-Induced Frequency Shift in Chemical Spirals

Valery Petrov, Qi Ouyang, Ge Li, and Harry L. Swinney*

Center for Nonlinear Dynamics and Department of Physics, University of Texas, Austin, Texas 78712

Received: May 13, 1996

In Final Form: July 8, 1996

Abstract:

Illumination of ruthenium-catalyzed Belousov-Zhabotinsky reaction decreases the rotational frequency of spirals at low bromate concentrations but increases the frequency at high bromate concentrations. The effective diffusion coefficient D deduced from the Keener-Tyson relation for the spirals, D /3k², is independent of light intensity (D = 2.5 × 10^-6 cm²/s).

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