Cumulene carbenes in TMC-1: Astronomical discovery of $l$-H${}_2$C${}_5$

C. Cabezas, B. Tercero, M. Agúndez +4

We report the first detection in space of the cumulene carbon chain $l$-H${}_2$C${}_5$. A total of eleven rotational transitions, with $J_{up}$ = 7-10 and $K_a$ = 0 and 1, were detecte…