Department of Physics, Graduate School of Science, Chiba University, Chiba 263-8522, Japan.
J Phys Chem A. 2009 Oct 1;113(39):10405-9. doi: 10.1021/jp903686k.
A chemical wave train propagating in a narrowing excitable channel surrounded by a nonexcitable field is investigated by using a photosensitive Belousov-Zhabotinsky (BZ) reaction. The considered geometry is created as a dark triangle surrounded by an illuminated area where the reaction is suppressed by the light-induced generation of bromide ion. For a low illumination level, a pulse train terminates at a constant position. However, as the light intensity increases, the position at which subsequent pulses disappear changes periodically, so that the period-doubling of penetration depth occurs. Two-dimensional simulations based on a modified Oregonator model for the photosensitive BZ reaction reproduce the essential features of the experimental observation.
用光致感应的 Belousov-Zhabotinsky（BZ）反应研究了在非兴奋场包围的狭窄可兴奋通道中传播的化学波列。所考虑的几何形状是一个黑暗三角形，周围是一个照明区域，在该区域中，反应被光诱导生成的溴离子抑制。对于低照明水平，脉冲列在恒定位置终止。然而，随着光强度的增加，后续脉冲消失的位置周期性地变化，从而发生穿透深度的倍周期。基于光致感应 BZ 反应的修正 Oregonator 模型的二维模拟再现了实验观察的基本特征。
