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The anharmonic and harmonic dissociation rate constants of alkylperoxy(RO2)in different pathways were calculated using RRKM method.As temperature/total energy was rising,the rate constants of different pathways varied independently,which indicated that temperature/energy played important roles in these reactions.Anharmonic rate constants were bigger than harmonic rate constants and the value of difference became larger as temperature/energy rose,so the anharmonic effect cannot be neglected.