Abstract
We have observed spatiotemporal patterns of photochemically produced emitting species in a locally irradiated aqueous solution of eriochrome black T and acetone. A series of sharp regular spikes have been observed in the emission time profile, each of which corresponds to convective motion in an asymmetrical roll. It is suggested that an autocatalytic photochemical reaction coupled with the convective instability is essential to understand the observed spatiotemporal pattern. Moreover, we present evidences that the autocatalytic photochemical process plays a crucial role in the appearance of sharp regular spikes instead of the irregular oscillations reported so far for photochemical oscillations.
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