Enhancement of Stochastic Resonance Induced by Either Internal or External Noise in NO Reduction on Platinum Surfaces

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• 作者：Yubing Gong ; Bo Xu ; Xiaoguang Ma ; Yongmian Dong ; Chuanlu Yang
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：March 22, 2007
• 年：2007
• 卷：111
• 期：11
• 页码：4264 - 4268
• 全文大小：83K
• 年卷期：v.111,no.11(March 22, 2007)
• ISSN：1932-7455

文摘

Using the chemical Langevin equation (CLE), we have studied the effects of the interaction between internaland external noise on the oscillatory kinetics in the mesoscopic stochastic system of NO reduction by CO onsingle-crystal platinum surfaces. It is found that, when the system is driven by internal and external noisesimultaneously, external noise and internal noise can enhance the stochastic resonance induced by internalnoise (SRIN) and by external noise (SREN), respectively. Moreover, there exists an optimal external noisestrength for the enhancement of SRIN and an optimal system size for the enhancement of the stochasticresonance by external noise (SREN), respectively. This result shows that internal and external noise wouldbenefit the stochastic reaction oscillations induced by each other, and play similar positive roles in enhancingSREN and SRIN, respectively, though they are generated in different mechanisms. In addition, theenhancements of SRIN and SREN are selective to external and internal noise intensity, respectively. It is alsoshown that the optimal system size for the SRIN and the optimal external noise intensity for the SREN canbe regulated by external noise and internal noise, respectively.