Abstract
The laser-induced fluorescence (LIF) spectrum for the à 1Πu–X̃ 1Σg+ band of C3 was observed under jet-cooled conditions. On the basis of our previous report [Chem. Phys. Lett. 242, 435 (1995)], in which the ν3 fundamental in the à 1Πu state was determined to be 541.7(1) cm−1 through the first identification of the Ã(0,0,1)–X̃(0,0,1) hot-band transition, we extended the measurements of the ν3 related key bands; the high-resolution spectra (Δν∼0.08 cm−1) of eight vibronically allowed Σu+–Σg+-type transitions and two Πg–Σu+ hot-band transitions were measured, and their rotational structures were analyzed. The determined band-origin wave numbers and the symmetries of the rotational structures led to firm assignments of the vibrational levels in the à 1Πu state. Using the vibrational level energies of the Ã(0,0,v3)(v3=1–3) levels, the anharmonic potential along the ν3 mode in the à 1Πu state was estimated to have double minima with a barrier height of 284.3 cm−1 at the linear configuration.
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