Abstract :
Target problem A+B→A has been studied by computer simulation of random walks of particles A on a simple cubic lattice with randomly removed bonds above the percolation threshold. The B particles are immobile. It is shown that at low concentrations of walkers, the nonexponential decay of particles B originates mainly from the rate constant distribution. At small times, the anomalous diffusion of walkers contributes to the nonexponential kinetic behavior as well. The distribution of specific reaction rates arises due to different configurations of removed bonds around the B particles.
