Submillimeter-wave rotational spectra of DNC in highly excited vibrational states observed in an extended negative glow discharge

► Sumillimeter-wave rotational lines of DNC have been observed for the ν3 excited states. ► DNC is formed in an extended negative glow discharge. ► The dissociative recombination reaction of DCND+ is the source of the excited DNC. ► The rotational and centrifugal distortion constants are determined for those excited states.