Dynamical effects induced by long range activation in a nonequilibrium reaction-diffusion system.
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.
Fuentes
M
M
Centro Atomico Bariloche and Instituto Balseiro, 8400 San Carlos de Bariloche, Argentina.
Kuperman
M N
MN
Boissonade
J
J
Dulos
E
E
Gauffre
F
F
De Kepper
P
P