Control of Turing structures by periodic illumination

Spatially uniform illumination of Turing structures in the chlorine dioxide -iodine-malonic acid reaction-diffusion system affects the pattern characte ristics and, at larger intensities, eliminates them. Periodic illumination is more effective than constant illumination with the same average light in tensity. We observe the fastest suppression of pattern at a frequency of il lumination equal to the frequency of autonomous oscillations in the corresp onding well-stirred system. Numerical simulations demonstrate a similar res onant behavior of periodically illuminated Turing structures.