Discovery of HC3O+ in space: The chemistry of O-bearing species in TMC-1.

  title={Discovery of HC3O+ in space: The chemistry of O-bearing species in TMC-1.},
  author={Jos{\'e} Cernicharo and N. Marcelino and Marcelino Ag{\'u}ndez and Yasuki Endo and Carlos Cabezas and C. Berm{\'u}dez and Bel{\'e}n Tercero and Pablo de Vicente},
  journal={Astronomy and astrophysics},
Using the Yebes 40m and IRAM 30m radio telescopes, we detected a series of harmonically related lines with a rotational constant B 0=4460.590±0.001 MHz and a distortion constant D 0=0.511 ±0.005 kHz towards the cold dense core TMC-1. High-level-of-theory ab initio calculations indicate that the best possible candidate is protonated tricarbon monoxide, HC3O+. We have succeeded in producing this species in the laboratory and observed its J u -J l = 2-1 and 3-2 rotational transitions. Hence, we… 

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