Space and laboratory observation of the deuterated cyanomethyl radical HDCCN

Carlos Cabezas; Yasuki Endo; Evelyne Roueff; Nuria Marcelino; Marcelino Agúndez; Belén Tercero; José Cernicharo

doi:10.1051/0004-6361/202040210

paper

Space and laboratory observation of the deuterated cyanomethyl radical HDCCN

arXiv:2101.05187 · doi:10.1051/0004-6361/202040210

Abstract

Our observations of TMC-1 with the Yebes 40 m radio telescope in the 31.0-50.3 GHz range allowed us to detect a group of unidentified lines, showing a complex line pattern indicative of an open-shell species. {}The observed frequencies of these lines and the similarity of the spectral pattern with that of the 2 $_{0, 2}$ -1 $_{0, 1}$ rotational transition of H $_{2}$ CCN indicate that the lines arise from the deuterated cyanomethyl radical, HDCCN. Using Fourier transform microwave spectroscopy experiments combined with electric discharges, we succeeded in producing the radical HDCCN in the laboratory and observed its 1 $_{0, 1}$ -0 $_{0, 0}$ and 2 $_{0, 2}$ -1 $_{0, 1}$ rotational transitions. From our observations and assuming a rotational temperature of 5 K, we derive an abundance ratio H $_{2}$ CCN/HDCCN=20 $\pm$ 4. The high abundance of the deuterated form of H $_{2}$ CCN is well accounted for by a standard gas-phase model, in which deuteration is driven by deuteron transfer from the H $_{2}$ D $^{+}$ molecular ion.

This article was submitted to A&A Letters on 23/12/2020 and accepted for publication on 10/01/2021

Space and laboratory observation of the deuterated cyanomethyl radical HDCCN

Abstract

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