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The rotationally resolved A 2 ⌸ u ←X 2 ⌸ g electronic origin band spectrum of dicyanodiacetylene cation, NC 6 N ϩ , has been recorded in the gas phase using frequency-production double modulation spectroscopy in a liquid nitrogen cooled hollow cathode discharge and cavity ring down spectroscopy in a supersonic plasma. The analysis of the complementary results provides accurate molecular parameters for the two spin-orbit components in both electronic states.

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