Observation of Laser Speckle Effects and Nonclassical Kinetics in an Elementary Chemical Reaction

An experimental demonstration is provided for memory-based, nonclassical reaction kinetics in a homogeneous system with an elementary reaction, $A+B\to C$. A new reaction-kinetics regime is observed which is a direct consequence of speckles in the laser beam. However, in spite of the nonrandom, speckled initial distribution of reactant $B$, the long-time regime gives the first experimental demonstration of the asymptotic self-segregation (“Zeldovich”) effect. Monte Carlo simulation results are consistent with the experiments.