title: Dynamical effects induced by long range activation in a nonequilibrium reaction-diffusion system.
abstract: We show both experimentally and numerically that the time scales separation introduced by long range activation can induce oscillations and excitability in nonequilibrium reaction-diffusion systems that would otherwise only exhibit bistability. Namely, we show that in the chlorite-tetrathionate reaction, where the autocatalytic species H+ diffuses faster than the substrates, the spatial bistability domain in the nonequilibrium phase diagram is extended with oscillatory and excitability domains. A simple model and a more realistic model qualitatively account for the observed dynamical behavior. The latter model provides quantitative agreement with the experiments.
authors.affiliation: Centro Atomico Bariloche and Instituto Balseiro, 8400 San Carlos de Bariloche, Argentina.
authors.forename: M
authors.initials: M
authors.lastname: Fuentes
authors.forename: M N
authors.initials: MN
authors.lastname: Kuperman
authors.forename: J
authors.initials: J
authors.lastname: Boissonade
authors.forename: E
authors.initials: E
authors.lastname: Dulos
authors.forename: F
authors.initials: F
authors.lastname: Gauffre
authors.forename: P
authors.initials: P
authors.lastname: De Kepper