Restructuring effects in the rain model for random deposition

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Abstract
Two kinds of restructuring mechanisms are investigated in the off-lattice « rain » (ballistic deposition) model for random deposition of particles on a line in two dimensions in which particles fall along random vertical lines and irreversibly stick to a growing deposit. In the first case, the falling particle is allowed to rotate about the first contacting particle in the deposit until a second contact is obtained. In the second case, the particle is allowed to rotate as often as necessary until it finally reaches a local minimum position. In both cases, the mean density of the deposit and the scaling behaviour of its surface thicknesses have been numerically investigated. It is found that the scaling properties are not affected by the first type of restructuring. For the second type of restructuring even very large scale simulations give ambiguous results but a simple lattice version of this model gives results which are quite different from those found in ordinary 2d ballistic deposition (the surface thickness (σ) grows as the 1/4 power of the deposit thickness)

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