Abstract
We report measurements of the 3P2←3P1 fine-structure transitions of both neutral atomic carbon species,12C and 13C, near 809 GHz with the Cologne terahertz spectrometer. The carbon atoms were produced in a DC glow discharge of a CO and He mixture at liquid nitrogen temperature. The 13C atoms were generated from an isotopically enriched 13CO sample. The 3P2←3P1 transition frequencies measured in absorption are determined to be These precise laboratory data are recommended for use as rest frequencies in future astronomical observations. The new value for the rest frequency of the 12C (J=2←1) transition removes a long-standing uncertainty and small discrepancy between existing laboratory data and astronomical measurements. The 13C rest frequencies have supported the first interstellar detection of this species, as reported by Keene et al.
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