We have investigated the N(2D) + CH3CCH (propyne) reaction and the N(2D) + H2CCCH2 (allene) reaction to elucidate the nature of the primary products and the micromechanism at play [Experimental] by coupling the crossed molecular beams (CMB) technique with mass spectrometric detection and time-of-flight analysis (angular distribution and tof spectra) [Theoretical] with electronic structure calculations of stationary points and product energetics (potential energy surface, PES). Furthermore, RRKM statistical calculations were performed to derive the product branching ratios (BRs) under the conditions of the present experiments and of the atmosphere of Titan.

This work was supported by the Italian Space Agency (DC-VUM-2017-034, Grant n° 2019-3 U.O Life in Space) and the Marie Sklodowska-Curie project ``Astro-Chemical Origins" (ACO), grant agreement No 811312.