Response Dynamics to Pulsed Perturbations of the Hydrogen Peroxide-Thiosulfate-Cu2+ Reaction

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• 作者：Old//pubs.acs.org/images/entities/rcaron.gif" border="0">ich Pe//pubs.acs.org/images/entities/scaron.gif" border="0">ek ; Vlasta Kofrá ; nková ; Lenka Schreibero
• 刊名：Journal of Physical Chemistry A
• 出版年：2008
• 出版时间：February 7, 2008
• 年：2008
• 卷：112
• 期：5
• 页码：826 - 832
• 全文大小：131K
• 年卷期：v.112,no.5(February 7, 2008)
• ISSN：1520-5215

文摘

The hydrogen peroxide-thiosulfate-Cu²⁺ reaction operated in a continuous flow stirred tank reactor is apH-oscillator known to provide three different steady states, hysteresis, and oscillations. In addition to thevarious dynamical regimes established earlier, a question arises whether the reaction can be also excitable,whereby the system strongly responds to a small but supercritical external addition of certain chemical species.We carried out experiments aimed at finding excitability and studying response dynamics to single and repeatedpulsed perturbations of varying amplitude and period. We found that the reaction displays a remarkableexcitatory dynamics when forced. The available mechanism of the reaction involves several adjustableparameters, which need to be tuned so that the model corresponds to experimentally observed bifurcationdiagrams. Our experimental findings are compared with numerical calculations, suggesting that the model isfar from complete.