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Titolo:
Laboratory investigation on the formation of unsaturated nitriles in Titan's atmosphere
Autore:
Balucani, N; Asvany, O; Osamura, Y; Huang, LCL; Lee, YT; Kaiser, RI;
Indirizzi:
Inst Atom & Mol Sci, Taipei 107, Taiwan Inst Atom & Mol Sci Taipei Taiwan 107 Atom & Mol Sci, Taipei 107, Taiwan Rikkyo Univ, Dept Chem, Toshima Ku, Tokyo 171, Japan Rikkyo Univ Tokyo Japan 171 niv, Dept Chem, Toshima Ku, Tokyo 171, Japan Univ Perugia, Dipartimento Chim, I-06123 Perugia, Italy Univ Perugia Perugia Italy I-06123 rtimento Chim, I-06123 Perugia, Italy Tech Univ Chemnitz Zwickau, Dept Phys, D-09107 Chemnitz, Germany Tech UnivChemnitz Zwickau Chemnitz Germany D-09107 07 Chemnitz, Germany
Titolo Testata:
PLANETARY AND SPACE SCIENCE
fascicolo: 5, volume: 48, anno: 2000,
pagine: 447 - 462
SICI:
0032-0633(200004)48:5<447:LIOTFO>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
CROSSED-BEAM REACTION; CN RADICAL REACTIONS; SUBMILLIMETER HETERODYNE OBSERVATIONS; HYDROCARBON MOLECULES; CHEMICAL-DYNAMICS; VERTICAL PROFILE; INFRARED-SPECTRA; LOW-TEMPERATURES; CYANO RADICALS; HIGH-INTENSITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Kaiser, RI Inst Atom & Mol Sci, 1,Sect 4,Roosevelt Rd, Taipei 107, Taiwan Inst Atom & Mol Sci 1,Sect 4,Roosevelt Rd Taipei Taiwan 107 an
Citazione:
N. Balucani et al., "Laboratory investigation on the formation of unsaturated nitriles in Titan's atmosphere", PLANET SPAC, 48(5), 2000, pp. 447-462

Abstract

Crossed molecular beam experiments of ground state cyano radicals, CN(X(2)Sigma(+)), with hydrocarbons acetylene (C2H2), ethylene (C2H4), methylacetylene (CH3CCH), allene (H2CCCH2), dimethylacetylene (CH3CCCH3), and benzene (C6H6) were performed to investigate the formation of unsaturated nitriles in Titan's atmosphere. These radical-neutral reactions have no entrance barrier, depict an exit barrier well below the energy of the reactant molecules, and are all exothermic. The CN radical attacks the pi electron density at the olefine, alkyne, and aromatic molecules; the formation of an initial addition complex is a common pathway on the involved potential energy surfaces for all reactions. A subsequent carbon-hydrogen bond rupture yields theunsaturated nitriles HCCCN, C2H3CN, CH3CCCN, H2CCCH(CN), H2CCCH2CN and C6H5CN as detected in our experiments. The explicit identification of this CN vs H atom exchange pathway under single collision, makes this reaction-class a compelling candidate to synthesize unsaturated nitriles in Titan's atmosphere. This versatile concept makes it even possible to predict the formation of nitriles once the corresponding unsaturated hydrocarbons are identified in Titan. Here, the C2H2 as well as cyanoacetylene, HCCCN, have been already identified unambiguously in Titan's troposphere. Those nitriles as sampled in our crossed beam experiments resemble an ideal challenge to be detected in the framework of the NASA-ESA Cassini-Huygens mission to Titan. (C) 2000 Elsevier Science Ltd. All rights reserved.

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Documento generato il 31/03/20 alle ore 19:32:47