LIGHT-INDUCED STATE TRANSITIONS IN THE OSCILLATORY CLO2(-) CL- IODOMALONIC ACID SYSTEM IN A SEMIBATCH REACTOR

The dynamical behavior of the oscillatory ClO2--Cl--iodomalonic acid r eaction in a semibatch reactor has been found to be extremely sensitiv e to the UV light, while the light above 420 nm does net affect the ki netics. Continuous illumination increases the amplitude and the period . Oscillations art completely extinguished beyond a critical light pow er. Light-induced transitions from nonoscillatory to oscillatory state and bursting-like responses upon periodic perturbations with 370 nm l ight have been found. The light-accelerated formation of a reactive io dine species from iodomalonic acid and its subsequent reaction with th e chlorite ion is responsible for the Light sensitivity of the dynamic al behavior.