We report the first observation of gas-phase electronic spectra for rhodium mononitride. The RhN molecules have been produced in the reaction of laser-ablated rhodium metal with ammonia. Many vibronic bands have been studied in the 400–700 nm region using laser-induced fluorescence. Rotational analyses of the stronger of these, together with excited state lifetime measurements and Rh 14 N–Rh 15 N isotopic shifts, identify three electronic systems in the region: [15.1]1–X 1 Σ + , [19.5]0 + –X 1 Σ + , and [22.4]0 + –X 1 Σ + with (0, 0) bands near 15071, 19489, and 22385 cm −1 , respectively. The 1 Σ + symmetry for the ground state agrees with theoretical predictions. Dispersed fluorescence spectra have been recorded which reveal the presence of electronic states at T = 553, 1740, and 3920 cm −1 .