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