Abstract
The kinetics of the reactions of ground state silicon ions Si+(2P) with C2H6, CH3OH, and CH3CH2OH has been investigated using a Selected Ion Flow Drift Tube technique (SIFDT). The reaction rate coefficients and the product distributions have been determined as functions of the reactant ion/reactant neutral average centre-of-mass kinetic energy (E CM).
The reactions studied are fast at thermal and near thermal energies and the reaction rate coefficients decrease by nearly one order of magnitude withE CM increasing up to a few eV. It is shown that the energy dependences of the measured reaction rate coefficients can be described by the function of the formk ≈ 1/[1+ (E CM/E CM1)m], whereE CM1 andm are parameters which can be determined from the experimental data. The results are interpreted in terms of a simple model assuming the reactions to proceed via the formation of long-lived complexes. These intermediate complexes decompose with unimolecular rate coefficientsk −1 andk 2 back to the reactants and forward to the products, respectively. The ratiosk −1/k 2 can be approximated for reactions studied by a power law functionk −1/k 2 ∞ (E CM)m.
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This work was supported in part by the Fonds zur Förderung der Wissenschaftlichen Forschung under project No. 10014, in part by the Grant Agency of the Czech Republic under project No. 94/0449, and by Charles University, Prague, under project No. GA UK 179/1996.
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Glosík, J., Zakouřil, P. & Lindinger, W. Experimental study of the reactions of Si+(2P) ions with several small organic molecules at near thermal energies. Czech J Phys 48, 29–44 (1998). https://doi.org/10.1023/A:1021236212910
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DOI: https://doi.org/10.1023/A:1021236212910