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Aims. This paper reports the laboratory detection of the rotational spectrum of the acetylide anion, CCH - . Methods. Five successive rotational transitions have been measured to high accuracy in a dc discharge with a free space millimeter-wave spectrometer in the frequency range 83–417 GHz. Results. Precise spectroscopic constants have been obtained for CCH - and transition rest frequencies can now be calculated to better than 1 km s -1 in equivalent radial velocity far into the terahertz region, allowing for deep astronomical searches for this anion in space. The highly stable and fairly polar CCH - anion is a likely candidate for radio astronomical detection, its neutral analogue CCH being among one of the most abundant molecules in a wide variety of astrophysical sources.

Laboratory detection of the negative molecular ion CCH-

Laboratory detection of the negative molecular ion CCH^-