Gas phase emission spectrum of dicyanodiacetylene radical cation has been detected. The band system which lies in the 630ndash;770thinsp;nm wavelength region was separated from the overlapping emission bands of the cyanogen radical by recording time resolved spectra. The He(Iagr;) photoelectron spectrum of dicyanodiacetylene is also presented and the inferred ionization energies, vibrational frequencies and assignments are given. From the latter data the emission spectrum is assigned as the quest;2Pgr;urarr;quest;2Pgr;gelectronic transition of dicyanodiacetylene radical cation. The frequencies of the four Sgr;+gvibrational fundamentals for the cationic ground state have been deduced from the emission spectrum.
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