The Haber‐Weiss cycle: image image was investigated at low pH by radiolysis of oxygen or nitrogen saturated solutions of hydrogen peroxide. It was found that reaction 2 has a low rate constant: k 2 = 3.0 ± 0.6 M ‐1 s ‐1 (pH 2.3, 22°C). The rate determining step of reaction 2 is most probably the transfer of an electron from a π 8 * orbital of HO 2 to the empty s̀ u * orbital of H 2 O 2 . Overlap between these two orbitals is hindered by the filled π 8 * orbitals of H 2 O 2 . Fe(HI)EDTA catalyses reaction 2.
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Koppenol et al. (1978) studied this question.
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