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The spectroscopic properties of representative aromatic hydroxycarbonium ions have been investigated and compared with those of the parent unprotonated carbonyl compounds. The energy levels, oscillator strengths, polarizations, and charge densities of the planar carbonium ions were calculated by a MO-SCF-CI procedure. Comparison of theoretical values with experimental quantities yielded satisfactory structural models for the cations. The aromatic ketones studied are readily soluble in sulfuric acid, are completely monoprotonated, and form very stable solutions. In contrast to the parent ketones, most hydroxycarbonium ions exhibited strong * -* fluorescence (0r > 0.5