Observation of nitrogen-bearing organic molecules from reactions of nitrogen atoms with hydrocarbons: A crossed beam study of N(D-2)+ethylene

The reaction of excited atomic nitrogen, N(D-2), with the simplest alkene, C2H4, has been investigated under single-collision conditions in crossed be am experiments with mass spectrometric detection. The experimental results clearly show that the N/H exchange channel leading to compounds of gross fo rmula C2H3N is the main reaction pathway and that the reaction proceeds thr ough the formation of a bound intermediate. The title reaction may well be regarded as a good candidate to account for the formation of acetonitrile, CH3CN, in extraterrestrial environments such as the dense atmosphere of Sat urn's moon Titan where the ultimate fate of product isomers other than acet onitrile itself, that is 2H-azirine, H2C(N)CH, and ketene imine, CH2=C=NH, is expected to be tautomerization to the most stable structure of acetonitr ile.