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Título: | A new protonated molecule discovered in TMC-1: HCCNCH+ |
Autor: | Agúndez, Marcelino CSIC ORCID; Cabezas, Carlos CSIC ORCID; Marcelino, Nuria CSIC ORCID; Fuentetaja, R. CSIC ORCID; Tercero, Belén CSIC ORCID; Vicente, P. de; Cernicharo, José CSIC ORCID | Palabras clave: | Astrochemistry ISM: molecules Line: identification Molecular processes Radio lines: ISM |
Fecha de publicación: | 24-mar-2022 | Editor: | EDP Sciences | Citación: | Astronomy & Astrophysics 659: L9 (2022) | Resumen: | In recent years we have seen an important increase in the number of protonated molecules detected in cold dense clouds. Here we report the detection in TMC-1 of HCCNCH+, the protonated form of HCCNC, which is a metastable isomer of HC3N. This is the first protonated form of a metastable isomer detected in a cold dense cloud. The detection was based on observations carried out with the Yebes 40m and IRAM 30m telescopes, which revealed four harmonically related lines. We derive a rotational constant B = 4664.431891 +/- 0.000692 MHz and a centrifugal distortion constant D = 519.14 +/- 4.14 Hz. From a high-level ab initio screening of potential carriers we confidently assign the series of lines to the ion HCCNCH+. We derive a column density of (3.0 +/- 0.5)e10 cm-2 for HCCNCH+, which results in a HCCNCH+/HCCNC abundance ratio of 0.010 +/- 0.002. This value is well reproduced by a state-of-the-art chemical model, which however is subject to important uncertainties regarding the chemistry of HCCNCH+. The observational and theoretical status of protonated molecules in cold dense clouds indicate that there exists a global trend in which protonated-to-neutral abundance ratios MH+/M increase with increasing proton affinity of the neutral M, although if one restricts to species M with high proton affinities (>700 kJ/mol), MH+/M ratios fall in the range 0.001-0.1, with no apparent correlation with proton affinity. We suggest various protonated molecules that are good candidates for detection in cold dense clouds in the near future. | Descripción: | 5 pags., 3 figs., 1 tab. | Versión del editor: | https://doi.org/10.1051/0004-6361/202243396 | URI: | http://hdl.handle.net/10261/269081 | DOI: | 10.1051/0004-6361/202243396 | ISSN: | 0004-6361 |
Aparece en las colecciones: | (CFMAC-IFF) Artículos |
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A new protonated molecule.pdf | Artículo principal | 274,84 kB | Adobe PDF | Visualizar/Abrir |
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