Volume 81, Number 3, February 2008
|Number of page(s)||6|
|Published online||31 December 2007|
Differential susceptibility to noise of mixed Turing and Hopf modes in a photosensitive chemical medium
Abteilung Physikalische Chemie, Fritz-Haber-Institut der Max-Plank-Gesellschaft - 14195 Berlin, Germany
2 Department of Systems Biology, Harvard Medical School - 02115 Boston, MA, USA
3 Departament de Química Física, Universitat de Barcelona - 08028 Barcelona, Spain
Accepted: 27 November 2007
We report on experiments with the photosensitive chlorine dioxide-iodine-malonic acid reaction (CDIMA) when forced with a random (spatiotemporally) distributed illumination. Acting on a mixed mode consisting of oscillating spots, close enough to the Hopf and Turing codimension-two bifurcation, we observe attenuation of oscillations while the spatial pattern is preserved. Numerical simulations confirm and extend these results. All together these observations point out to a larger vulnerability of the Hopf with respect to the Turing mode when facing noise of intermediate intensity and small correlation parameters.
PACS: 05.40.Ca – Noise / 82.40.Ck – Pattern formation in reactions with diffusion, flow and heat transfer / 47.54.-r – Pattern selection; pattern formation
© EPLA, 2008
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