REACTANT CLUSTERING IN HETEROGENEOUS CATALYSIS WITH SURFACE-DIFFUSION

For the model A + B --> AB with diffusion, segregation of the species is found to lead to a self-similar cluster size distribution at the phase transition point, X(A) = X(B) = 1/2, namely n(s) approximate to S--tau, with tau = 2.06+/-0.1. The fractal dimension of clusters of either A or B species is found to be D-A = D-B = 1.92+/-0.06.