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On the Detection of Cyanopropyne in the ISM
Cyanopropyne, CH3C3N, also known as methylcyanoacetylene or methylpropionitrile, has been detected with the 45 m NRAO telescope in the J = 6 – 5 to 8 – 7 transitions with K = 0 and 1 between 27.7 and 33.1 GHz in emission toward TMC-1, by
N. W. Broten, J. M. MacLeod, L. W. Avery, W. M. Irvine, B. Höglund, P. Friberg, and Å. Hjalmarson,
Detection of Interstellar Methylcyanoacetylene
Astrophys. J. 276, L25–L29 (1984).
In addition, the J = 5 – 4, K = 0 transition was barely detected.
J. Cernicharo, M. Agúndez, C. Cabezas, N. Marcelino, B. Tercero, J. R. Pardo, J. D. Gallego, F. Tercero, J. A. López-Pérez, and P. de Vicente
reported on
Discovery of CH<sub>2</sub>CHCCH and detection of HCCN, HC<sub>4</sub>N, CH<sub>3</sub>CH<sub>2</sub>CN, and, tentatively, CH<sub>3</sub>CH<sub>2</sub>CCH in TMC-1
Astron. Astrophys. 647, Art. No. L2 (2021).
Butenyne, aka vinylacetylene, was identified through 6 a-type transitions with 3 ≤ J ≤ 5 and Ka = 0 and 1 in the course of a molecular line survey of the prototypical cold dark molecular cloud TMC-1 carried out with the Yebes 40 m radio telescope between 32.8 and 49.2 GHz. A value of Trot = 5.0 ± 0.5 K was derived. The column density of butenyne is about a factor of 1.8 higher than that of the isoelectronic vinyl cyanide.
Contributor(s): H. S. P. Müller; 08, 2012; 06, 2021