Direct Observation of a Fundamental Arylium Species Using Photoelectron Spectroscopy: Singlet–Triplet Gap in Phenylium - Megan R. Bentley; Ugo Jacovella; Jean-Christophe Loison; Myriam Drissi; Gustavo A. Garcia; Séverine Boyé-Péronne; Peter R. Franke; John F. Stanton; Bérenger Gans (Journal of the American Chemical Society, 2025)