We report a dispersed fluorescence spectrum obtained for excitation of a ∑+u–∑+g vibronic band of C3 at 33 588 cm−1, part of a newly discovered electronic system. Rotationally resolved stimulated-emission-pumping spectra of jet-cooled C3 using this ∑+u intermediate state are presented for dumping to the 0v121 (1≤v2≤13) and 6v121 (1≤v2≤5) levels in the 1Σ+g ground state. Vibrational term energies, rotational constants, and l-type doubling parameters are determined for each level.
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Rohlfing et al. (1989) studied this question.
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