Although the dissociative electron transfer reactions between protons and carbon dioxide are endothermic by 0.19-9.1 eV, the reactions have a large total cross section at low keV collision energies. The results are quantitatively modelled in terms of the modified Strueckelberg-Demkov mechanism for the non-crossing of reactant and product diabatic potential energy curves. Charge transfer to give the ground state of CO+2 occurs at 4.05-4.26 Å. The H atom and CO+2 formed may then suffer a non-crossing excitation at 1.6-2.1 Å during the evolution of a single-collision event, to produce the excited CO+2. The experimental results cannot be interpreted by a curve crossing mechanism of the Landau-Zener type. © 1987.
|Number of pages||6|
|Publication status||Published - 15 Jan 1987|