The Dissociative Recombination of Protonated Acrylonitrile, CH2CHCNH+, with Implications for the Nitrile Chemistry in Dark Molecular Clouds and the Upper Atmosphere of Titan

Details The Dissociative Recombination of Protonated Acrylonitrile, CH2CHCNH+, with Implications for the Nitrile Chemistry in Dark Molecular Clouds and the Upper Atmosphere of Titan The Dissociative Recombination of Protonated Acrylonitrile, CH2CHCNH+, with Implications for the Nitrile Chemistry in Dark Molecular Clouds and the Upper Atmosphere of Titan

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...695..317v&link_type=abstract

The Astrophysical Journal, Volume 695, Issue 1, pp. 317-324 (2009).

Astronomy and Astrophysics

Astronomy

6

Ism: Clouds, Ism: Molecules, Methods: Laboratory, Molecular Processes

Scientific paper

Measurements on the dissociative recombination (DR) of protonated acrylonitrile, CH2CHCNH+, have been performed at the heavy ion storage ring CRYRING located in the Manne Siegbahn Laboratory in Stockholm, Sweden. It has been found that at ~2 meV relative kinetic energy about 50% of the DR events involve only ruptures of X-H bonds (where X = C or N) while the rest leads to the production of a pair of fragments each containing two heavy atoms (alongside H and/or H2). The absolute DR cross section has been investigated for relative kinetic energies ranging from ~1 meV to 1 eV. The thermal rate coefficient has been determined to follow the expression k(T) = 1.78 × 10-6 (T/300) - 0.80 cm3 s-1 for electron temperatures ranging from ~10 to 1000 K. Gas-phase models of the nitrile chemistry in the dark molecular cloud TMC-1 have been run and results are compared with observations. Also, implications of the present results for the nitrile chemistry of Titan's upper atmosphere are discussed.

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