Seven rovibrational transitions of the (01(1)0) ← (00(0)0)fundamental bending band of C3 have been measured with high precisionwith the use of a tunable far-infrared laser spectrometer. The C3molecules were produced by laser vaporization of a graphite rod andcooled in a supersonic expansion. The astrophysically important nu 2fundamental frequency is determined to be 63.416529(40) cm-1. Thesemeasurements provide the basis for studies of C3 in the interstellarmedium with far-infrared astronomy.

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