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Título: | Detection of deuterated methylcyanoacetylene, CH2DC3N, in TMC-1 |
Autor: | Cabezas, Carlos CSIC ORCID; Roueff, E.; Tercero, Belén CSIC ORCID; Agúndez, Marcelino CSIC ORCID; Marcelino, Nuria CSIC ORCID; Vicente, P. de; Cernicharo, José CSIC ORCID | Palabras clave: | Astrochemistry ISM: molecules ISM: individual objects: TMC-1 Line: identification Molecular data |
Fecha de publicación: | 21-jun-2021 | Editor: | Springer Nature | Citación: | Astronomy and Astrophysics 650: L15 (2021) | Resumen: | We report the first detection in space of the single deuterated isotopologue of methylcyanoacetylene, CH2DC3N. A total of 15 rotational transitions, with J = 8-12 and Ka = 0 and 1, were identified for this species in TMC-1 in the 31.0-50.4 GHz range using the Yebes 40 m radio telescope. The observed frequencies were used to derive for the first time the spectroscopic parameters of this deuterated isotopologue. We derive a column density of (8.0 ± 0.4)×1010 cm-2. The abundance ratio of CH3C3N to CH2DC3N is ∼22. We also theoretically computed the principal spectroscopic constants of 13C isotopologues of CH3C3N and CH3C4H and those of the deuterated isotopologues of CH3C4H for which we could expect a similar degree of deuteration enhancement. However, we have not detected either CH2DC4H or CH3C4D, nor any 13C isotopologues. The different observed deuterium ratios in TMC-1 are reasonably accounted for by a gas-phase chemical model where the low temperature conditions favour deuteron transfer through reactions with H2D+. | Descripción: | 5 pags., 1 fig., 4 tabs. | Versión del editor: | http://dx.doi.org/10.1051/0004-6361/202141371 | URI: | http://hdl.handle.net/10261/257222 | DOI: | 10.1051/0004-6361/202141371 | Identificadores: | doi: 10.1051/0004-6361/202141371 issn: 1432-0746 |
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