R. Fuentetaja, C. Bermúdez, C. Cabezas, M. Agúndez, B. Tercero, N. Marcelino, J. R. Pardo, L. Margulès, R. A. Motiyenko, J.-C. Guillemin, P. de Vicente, and J. Cernicharo
reported on the
Discovery of CH₃CHCO in TMC-1 with the QUIJOTE Line Survey
Astron. Astrophys. 671, (2023), Art. No. L6.
Ten rotational transitions with 3 ≤ J ≤ 5 and K_a were identified with resolved methyl internal rotation splitting. A sufficiently large fraction of the lines is not or only marginally blended and above the 3σ noise level. The ketene to methylketene ratio is ~93; the ratio of methylketene to it isomer trans-propenal is about 2/3.

Contributor(s): H. S. P. Müller; 03, 2023