Fig. 2. Time dependence of relative ion abundancies for the reaction of [Fe^IV(O)(TPFPP⁺˙)]⁺ (m/z 1044) with indene. Product ions are [Fe^III(TPFPP)]⁺ (m/z 1028), [Fe(TPFPP)(C₉H₈)O]⁺ (m/z 1160) and C₉H₈⁺˙ (m/z 116). Experiments were performed in the presence of indene at 5.2 × 10^–8 mbar in the FT-ICR cell.