Abstract
High-resolution translational energy spectroscopy (up to 0.1 eV) has been carried out on 8 kV of C2+ and C2D+. The spetra obtained with C2+ formed by different methods show considerable differences which are attributed to the formation of different spin states of the ion. Tentative assignments for the observed transitions have been made including one corresponding to excitation of the 4∑g− —X 4∑g− system, which may be useful as a probe of interstellar C2+. Two broad transitions have been seen in the translational energy spectrum of C2D+ which are in reasonable agreement with existing theoretical calculations. Tentative assignments are proposed for these transitions.
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