Astronomical detection of C$\mathsf{_{4}H^-}$, the second interstellar anion

By J. Cernicharo, M. Guélin, M. Agúndez, K. Kawaguchi, M. McCarthy, P. Thaddeus. 2007

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Detection of the Carbon Chain Negative Ion C8H– in TMC-1 (2007, unknown): “Of these, C4H has recently been detected in IRC 10 216 (Cernicharo et al. 2007) on the basis of the laboratory rest frequencies, which have been determined to better than 0.1 km s 1.”
Laboratory and Astronomical Detection of the Negative Molecular Ion C3N− (2008, methodology): “From the observed values ½C4H /½C4H ¼ 1/4200 and ½C6H /½C6H ¼ 1/16 (Cernicharo et al. 2007), we arrive at kratt(C4H)¼ 2 ;10 10 cm3 s 1 and kratt(C6H)¼ 5 ;10 8 cm3 s 1.”
2018 Census of Interstellar, Circumstellar, Extragalactic, Protoplanetary Disk, and Exoplanetary Molecules (2018, background): “C4H– (butadiynyl anion) Cernicharo et al. (2007) reported the detection of C4H– in IRAM 30-m observations of IRC+10216 through observation of five transitions between 84– 140 GHz.”
Astronomical identification of CN^-, the smallest observed molecular anion (2010, background): “Thus CN− appears confined to the same outer envelope of IRC+10216, as that of other molecu- lar anions observed in this source (e.g. Cernicharo et al. 2007; Thaddeus et al. 2008; Cernicharo et al. 2008).”
Detection of C5N− and Vibrationally Excited C6H in IRC +10216 (2008, methodology): “First of all, as noted by Guélin et al. (1998), the abundance decrement C3N/C5N is an order of magnitude larger than that of HC3N/HC5N and C4H/C6H, both in IRC+10216 and in TMC-1 — yet all chemical models predict it to be similar.”