Abstract
Results of molecular-dynamics simulations of the condensation of Ni atoms from a supersaturated gas phase and the subsequent formation and growth of particles in an Ar atmosphere are reported. The Ni concentration and the Ar partial pressure resemble the conditions found in recent shock-tube experiments. In order to achieve a realistic description of the microscopic processes leading to particle formation, the inert gas atoms were explicitly included in the simulations. Excess energy released during the nucleation processes is thereby transferred directly to the carrier gas via collision events. The influence of temperature on the speed of Ni atom condensation as well as particle growth is investigated. Rates of formation of Ni dimers are calculated and compared with values obtained from experiment.
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