Figure 4.

Low temperature (20K) EPR spectra of NDO samples, collected after 10s before freezing in liquid nitrogen: (a) mixed with an equal volume of O₂-saturated naphthalene before and (b) after treatment with H₂O₂. (c) 20K EPR spectrum of NDO, in the absence of naphthalene, treated with H₂O₂. All spectra were recorded at 9.38GHz; 1mT modulation amplitude; 2mW microwave power and 100KHz modulation frequency. In the inset: room temperature UV-Vis spectra of (a) native NDO; (b) NDO after the addition of H₂O₂, t0 min; (c) t1 min; (d) t5 min; and (e) t10 min.