In this article, about 30 aromatic ions have been studied with the элр-2 975 Kc high frequency modulation spectrometer. Most of them show well resolved hyperfine patterns. Part of them is compared with the theoretical hyperfine patterns deduced from the McConnell's σ-π configurational interaction theory and Hückel L.C.A.O.-M.O. theory. The coincidence between experimental and theoretical patterns is considered to be satisfactory.