Abstract
A recent Letter in this Journal (Gladich et al. J. Phys. Chem. Lett. 13, 2994-3001) reported that photoelectron spectroscopy could not detect any products on the surface of aqueous Fe2+ jets dosed with gaseous hydrogen peroxide. The Letter however concluded that Fe(aq)2+ ions react with H2O2(g) at the water-vapor interface to produce the same Fe3+ + HO• products as their reaction with H2O2(aq) in bulk water. We argue that this conclusion is untenable because nothing can be asserted about undetected species.
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