| 5cFe(II) (430 nm) ↔ 6cFe(II)NO (420 nm) | (k1 / k−1, 4.5 × 108 M−1 s−1/ 27 s−1) |
| 6cFe(II)NO → 5cFe(II)NO (399 nm) (D*) | (k2 / k−2, 8.5 s−1/ 0.001 s−1) |
| 5cFe(II)NO → {6cxFe(II)NO} (E*) | (k3 / k−3, 0.06 s−1/ 0 s−1) |
| {6cxFe(II)NO} → 5cxFe(II) (430 nm) | (k4 / k−4, 2 s−1/ 0 s−1) |
| 5cxFe(II) → 5cxFe(II)NO (399 nm) | (k5/k−5, 0.006 s−1/ 0 s−1) |