Discovery of H${}_2$CCCH${}^{+}$ in TMC-1

W. G. D. P. Silva, J. Cernicharo, S. Schlemmer +13

Based on a novel laboratory method, 14 mm-wave lines of the molecular ion H${}_2$CCCH${}^{+}$ have been measured in high resolution, and the spectroscopic constants of this asymmetric ro…