Discovery of H${}_2$CCCH${}^{+}$ in TMC-1

Abstract

Based on a novel laboratory method, 14 mm-wave lines of the molecular ion H${}_2$CCCH${}^{+}$ have been measured in high resolution, and the spectroscopic constants of this asymmetric rotor determined with high accuracy. Using the Yebes 40 m and IRAM 30 m radio telescopes, we detect four lines of H${}_2$CCCH${}^{+}$ towards the cold dense core TMC-1. With a dipole moment of about 0.55 Debye obtained from high-level ab initio calculations, we derive a column density of 5.4$\pm$1$\times$10${}^{11}$ cm${}^{-2}$ and 1.6$\pm$0.5$\times$10${}^{11}$ cm${}^{-2}$ for the ortho and para species, respectively, and an abundance ratio N(H${}_2$CCC)/N(H${}_2$CCCH${}^{+}$)= 2.8$\pm$0.7. The chemistry of H${}_2$CCCH${}^{+}$ is modelled using the most recent chemical network for the reactions involving the formation of H${}_2$CCCH${}^{+}$. We find a reasonable agreement between model predictions and observations, and new insights into the chemistry of C${}_3$ bearing species in TMC-1 are obtained.

References in corpus (13)

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Cited by in corpus (8)

• Discovery of two cyano derivatives of acenaphthylene (C${}_{12}$H${}_8$) in TMC-1 with the QUIJOTE line survey
• High Resolution Rovibrational and Rotational Spectroscopy of H${}_2$CCCH${}^{+}$
• Hyperfine-Resolved Rotational Spectroscopy of HCNH+
• Ion-molecule routes towards cycles in TMC-1. An automated study of the C2H4 + CH2CCH+ reaction
• A search for the three isomers of cyano-1,3-butadiene in TMC-1: Implications for bottom-up routes involving 1,3-butadiene
• Spectroscopic Detection and Characterization of Cyanooxomethylium, NCCO${}^{+}$
• High-resolution ro-vibrational and rotational spectroscopy of the open-shell, linear CCH${}^{+}$ ion (${}^3\Pi$)
• Carbon chain diversity in L1544 and IRAS 16293-2422: an astrochemical pathfinder study for the SKAO