Reaction Dynamics of Small Carbon Clusters with Unsaturated Hydrocarbons in the Interstellar Medium

摘要: Crossed molecular beams experiments of dicarbon, C2(X1Σg+/a3Πu), and tricarbon molecules, C3(X1Σg+), with unsaturated hydrocarbons acetylene (C2H2), ethylene (C2H4), methylacetylene (CH3CCH), allene (H2CCCH2) were carried out at 27 collision energies between 11 128 kJmol−1 utilizing a universal crossed machine. The data suggest that all reactions C2 C3 are indirect involve cyclic intermediates formed by an initial addition dicarbon or molecule to the π bond hydrocarbon; these isomerize acyclic structures. latter found decompose via atomic/molecular hydrogen loss C4H [HCCCC], i‐C4H3 [H2CCCCH], C5H[HCCCCC], C5H2[H2CCCCC], n‐C5H3 [HCCCCCH2], i‐C5H3[HCCCHCCH], C6H3 [H2CCCCCCH]. All barrier‐less, whereas pronounced entrance barriers 40 80 present in channel reactions. identification versus atomic at...