Kinetic Monte Carlo simulation of heterogeneous and homogeneous radio-oxidation of a polymer

Ion irradiation is known to generate well-localized cylindrical ionization and excitation tracks in materials. The resulting radiation chemistry organic material thus initiated by a strongly heterogeneous source of radicals. We present comparison homogeneous radio-oxidation kinetics polymer. Our analysis based on kinetic Monte Carlo simulation the diffusion-reaction process radicals material. consider, as numerical test case, polyethylene 5 MeV He ions. For kinetics, we show that spatial distribution reached stationary regime not at sub-micrometer scale. Both are quite comparable regarding variation radical concentration with time. However, yield peroxy significantly lower case kinetics. Moreover, propagation characterized ratio POOH over POOP products exhibits very different behaviors respect oxygen concentration.