Oscillation in penetration distance in a train of chemical pulses propagating in an optically constrained narrowing channel.
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.
Kitahata
Hiroyuki
H
Department of Physics, Graduate School of Science, Chiba University, Chiba 263-8522, Japan.
Fujio
Kenji
K
Gorecki
Jerzy
J
Nakata
Satoshi
S
Igarashi
Yasuhiro
Y
Gorecka
Agnieszka
A
Yoshikawa
Kenichi
K