The reaction of CH3O2 radicals with acetaldehyde on the solid surface of NH4NO3 has been studied in a flow capillary reactor at low pressure and room temperature. The experiments were performed using EPR spectrometer combined with the kinetic method of radicals freezing. Peroxy radicals revealed an oscillation complex behavior during the process regarding to the phenomenon of radicals multiplication. The kinetic peculiarities of process depend intensively on the concentration and the nature of organic compound and aerosol surface. The increase of mass percentage of oxygen of the aerosol substances can be responsible for increasing the amplitude of radicals oscillation behavior. پرونده مقاله