Abstract
Rotationally resolved absorption spectra of the A∼1Πu–X∼1Σg+ origin band of the tricarbon molecule (C3) are reported for 12C3 and its 13C-substitued isotopologues. The 4051Å electronic transition, also identified in cometary tails and in translucent interstellar clouds, has been measured using cavity ring-down spectroscopy and a supersonically expanding planar plasma. Previous spectroscopic studies of 12C3 are extended and the electronic origin band is re-investigated including a perturbation analysis of the upper state. The rotational analysis of spectra originating from 13C mono- and di-substituted C3 yields accurate spectroscopic parameters for all six isotopologues, including ground state molecular constants for 13C12C13C and 12C13C13C.
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