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Results from a modified Diffusion Limited Aggregation (DLA) model arepresented. The modifications of the classical DLA model are in the attachmentto the cluster rules and in the scheme of particle generation/killing. In theclassical DLA model if a particle reaches the growing cluster it sticks to itimmediately and irreversibly and then the next particle is released. We willabandon this original prerequisite, and by changing the sticking probability tothe cluster we will change the diffusion regime towards more kinetic one. For agrowing cluster consisting of only one type of particles this variation in thesticking probability is (more or less) a rude violation of the hypothesis fordiffusion limitation in the DLA model. Since in a lot of experiments differenttypes of particles are used with different sticking probabilities (e.g.different regimes of attachment), we develop a modified DLA model with twotypes of particles. The second modification we introduce at that point is ascheme for particle generation/killing we call "second chance" - when aparticle is killed after reaching a given limiting distance from the cluster,it is killed and then returned to the point it was originally generated. Thusthe model is capable to produce a great variety of growing patterns (fractals,spirals) by changing only a single parameter and we are able to construct amorphological diagram of our generalized DLA model with two different types ofparticles.

Diffusion Limited Aggregation with modified local rules