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nsf2011

Unraveling the Formation of Interstellar Benzene. Ralf I. Kaiser, University of Hawaii at Manoa, Honolulu, HI, 96822.

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nsf2011

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  1. Unraveling the Formation of Interstellar Benzene. Ralf I. Kaiser, University of Hawaii at Manoa, Honolulu, HI, 96822 Polycyclic aromatic hydrocarbons (PAHs) and related species have been suggested to play a key role in the astrochemical evolution of the interstellar medium, but the formation mechanism of even their simplest building block - the aromatic ben­zene molecule – has remained elusive for decades. Here we demonstrate in cros­sed molecular beam experi­ments combined with electronic structure and statistical calcu­la­ti­ons that benzene (C6H6) can be syn­the­si­zed via the barrier-less, exoergic reaction of the ethynyl radical (C2H) and 1,3-butadiene (H2CCHCHCH2) under single collision con­di­tions. Novel gas–grain astrochemical models imply that this low-tem­perature route controls the synthesis of the very first aromatic ring from acyclic precursors in cold mole­cu­lar clouds such as in TMC-1. B. M. Jones, F. Zhang, R. I. Kaiser, A. M. Mebel, M. A. Cordiner, S.B. Charnley, Unraveling the Formation of Interstellar Benzene. PNAS, 108, 452-457 (2011).

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