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The formation and growth rates of dispersed carbon particles were determined experimentally for pyrolysis of ethylene, benzene, and naphthalene in a reflected shock wave at temperatures of 1920-2560 K and hydrocarbon concentrations in argon of 1.8-20%. The diameter of the particles formed was estimated (30-600Å). The maximum rate of particle formation at various temperatures [(0.7-96) · 10 16 cm −3 · sec −1 ] and the particle growth rate (0.002-0.036 cm · sec −1 ) were determined from results of measurements of reaction (residence) times. For pyrolysis of benzene, the activation energy of the overall process of particle formation is 410 kJ/mole, and for all hydrocarbons studied, the activation energy of the overall process of particle growth is 5-50 kJ/mole. The surface average particle diameter increases with increasing concentration of the initial hydrocarbon at a constant temperature.