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The sets of individual EPR spectra (SW = 8 mT) monitored upon continuous UVA irradiation (λmax = 365 nm; irradiance 15 mW∙cm−2) of aerated TiO2 P25 suspensions in the presence of sterically hindered amine TMPO: (a) oxygenated water; (b) oxygenated water saturated with β-carotene; (c) oxygenated mixed solvent water/DMSO (5:1 v:v); (d) aerated ACN. TiO2 concentration 0.167 mg∙mL−1, c0,TMPO = 0.008 M.
