Collect. Czech. Chem. Commun. 2003, 68, 178-188

Charge Transfer Between CO22+ and Ar or Ne at Collision Energies 3-10 eV

Libor Mrázek, Ján Žabka, Zdeněk Dolejšek and Zdeněk Herman*

V. Čermák Laboratory, J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague 8, Czech Republic


The beam scattering method was used to investigate non-dissociative single-electron charge transfer between the molecular dication CO22+ and Ar or Ne at several collision energies between 3-10 eV (centre-of-mass, c.m.). Relative translational energy distributions of the product ions showed that in the reaction with Ar the CO2+ product was mainly formed in reactions of the ground state of the dication, CO22+(X3Σg-), leading to the excited states of the product CO2+(A2Πu) and CO2+(B2Σu+). In the reaction with Ne, the largest probability had the process from the reactant dication excited state CO22+(1Σg+) leading to the product ion ground state CO2+(X2Πg). Less probable were processes between the other excited states of the dication CO22+, (1g), (1Σu-), (3u), also leading to the product ion ground state CO2+(X2Πg). Using the Landau-Zener model of the reaction window, relative populations of the ground and excited states of the dication CO22+ in the reactant beam were roughly estimated as (X3Σg):(1g):(1Σg+):(1Σu-):(3u) = 1.0:0.6:0.5:0.25:0.25.

Keywords: Charge transfer; Dications; Energetics; Electronic state population; Beam scattering; Carbon dioxide; Noble gases.

References: 24 live references.