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Collision-induced dissociative excitation reactions involving collisions of N2+ and CO^+ ions and HgI_2 molecules have been studied in the kinetic energy range of 100–1000 eV (laboratory frame). Emission spectra from the B ? X transition of the HgI radical as well as atomic mercury lines from various highly excited energy levels have been observed and analyzed. Emission cross sections of the most intense molecular band of the HgI(B^2∑^+,v′ = 0 ? X^2∑^+,v″ = 22) transition at 445 nm have been determined.