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Publication Detail
The formation of NH+ following the reaction of N-2(2+) with H-2
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Lockyear JF, Ricketts CL, Parkes MA, Price SD
  • Publisher:
    ROYAL SOC CHEMISTRY
  • Publication date:
    2011
  • Pagination:
    150, 156
  • Journal:
    CHEM SCI
  • Volume:
    2
  • Issue:
    1
  • Print ISSN:
    2041-6520
  • Language:
    EN
  • Keywords:
    CHARGE-TRANSFER REACTIONS, CROSS-SECTION DATA, MOLECULAR DICATIONS, ELECTRON-TRANSFER, CHEMICAL-REACTIONS, BEAM SCATTERING, GAS-PHASE, IONS, DYNAMICS, IONOSPHERE
  • Addresses:
    Price, SD
    UCL
    Dept Chem
    London
    WC1H 0AJ
    England
Abstract
The nitrogen molecular dication (N-2(2+)) has been proposed as a minor but significant component of the ionosphere of Saturn's moon Titan with an abundance comparable to that of several key monocations. It has also been suggested that the reactions of N-2(2+) with H-2 can provide a source of N2H2+ in Titan's atmosphere. This paper reports the results from experiments, using a position-sensitive coincidence technique, which reveal the chemical reactions forming pairs of monocations following collisions of the N-2(2+) dication with H-2(D-2) at a centre-of-mass collision energy of 0.9(1.8) eV. These experiments show, in addition to single electron-transfer processes, a bond-forming pathway forming NH+ + H+ + N and allow an estimate to be made of the reaction cross section and the rate coefficient for this reaction. The correlations between the product velocities revealed by the coincidence experiments show that NH+ is formed via N atom loss from a primary encounter complex [N2H2](2+) to form NH22+, with this triatomic daughter dication then fragmenting to yield NH+ + H+. A computational investigation of stationary points on the lowest energy singlet and triplet [N2H2](2+) potential energy surfaces confirms the mechanistic deductions from the experiments and indicates that the formation of NH+ occurs solely, and efficiently, from the reaction of the c(3)Sigma(+)(u) excited electronic state of N-2(2+).
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