Letter to the Editor
Laboratory detection of the negative molecular ion CCH-
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA, and Division of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, MA 02138, USA e-mail: firstname.lastname@example.org
2 Institute for Theoretical Chemistry, Department of Chemistry and Biochemistry, The University of Texas, Austin, TX 78712, USA
Accepted: 19 January 2007
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.
Key words: line: identification / molecular data / astrochemistry / methods: laboratory / ISM: molecules / radio lines: ISM
© ESO, 2007