Detection of C8H– and Comparison with C8H toward IRC +10 216

By A. Remijan, J. Hollis, Francis J. Lovas, M. Cordiner, T. J. Millar, A. J. Markwick-Kemper, P. Jewell. 2007

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The UMIST database for astrochemistry 2012 (2012, background): “Since then, it and other anions have been detected in a variety of sources (Brünken et al. 2007; Remijan et al. 2007; Sakai et al. 2010b; Cordiner et al. 2011).”
2018 Census of Interstellar, Circumstellar, Extragalactic, Protoplanetary Disk, and Exoplanetary Molecules (2018, background): “C8H– (octatriynyl anion) Brünken et al. (2007) and Remijan et al. (2007) simultaneously reported the detection of C8H– .”
Laboratory and Astronomical Detection of the Negative Molecular Ion C3N− (2008, result): “The abundance ratio [C3N ] / [C3N] of 0.52% is about 20 times larger than [C4H ] / [C4H], but is 12 times smaller than [C6H ] / [C6H] (Cernicharo et al. 2007) and 50–70 times smaller than [C8H ]/[C8H] in this source (Remijan et al. 2007; Kawaguchi et al. 2007).”
Astronomical identification of CN^-, the smallest observed molecular anion (2010, background): “…heavy linear carbon chains with three or more carbon atoms, and with neutral counterparts with large electron affinities: C4H−, C6H−, C8H−, C3N−, and C5N− (McCarthy et al., 2006; Cernicharo et al., 2007; Brünken et al., 2007a; Remijan et al., 2007; Thaddeus et al., 2008; Cernicharo et al., 2008).”