C. Cabezas, M. Agúndez, N. Marcelino, B. Tercero, J. R. Pardo, P. de Vicente, and J. Cernicharo
reported on the
Discovery of Interstellar 3-Cyanopropargyl Radical, CH₂CCCN
Astron. Astrophys. 654, Art. No. L9 (2021).
ortho-CH₂CCCN was identified through three a-type transitions with J = 8 − 7 to 10 − 9 and K_a = 0 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 31.0 and 50.4 GHz. These transitions displayed partially resolved fine and hyperfine structure splitting; few components were blended by lines of other species.