Crossed-Beam Scattering Studies of Electron-Transfer Processes between the Dication CO22+ and Neutral CO2: Electronic States of Reactants and Products Involved

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• 作者：Jan abka ; Claire L. Ricketts ; Detlef Schrder ; Jana Roithov ; Helmut Schwarz ; Roland Thissen ; Odile Dutuit ; Stephen D. Price ; Zdenek Herman
• 刊名：Journal of Physical Chemistry A
• 出版年：2010
• 出版时间：June 17, 2010
• 年：2010
• 卷：114
• 期：23
• 页码：6463-6471
• 全文大小：267K
• 年卷期：v.114,no.23(June 17, 2010)
• ISSN：1520-5215

文摘

Crossed-beam scattering experiments were carried out at collision energies of 4.51 and 2.71 eV to elucidate the electronic states involved in the nondissociative and dissociative electron-transfer reactions observed following CO₂²⁺/CO₂ collisions. Specifically, we focus on the observation that, in the dissociative electron-transfer reaction, forming CO⁺, the majority of the CO⁺ product ions are formed via electron capture by the CO₂²⁺ rather than via ejection of an electron from the neutral CO₂ reaction partner. The main channels resulting in nondissociative electron transfer are reactions of the ground (X³Σ_g⁻) and excited states of CO₂²⁺ to give different combinations of the ground and excited states of the product pair of CO₂⁺ ions in which the combination AA appears to be significant. The CO⁺ ions appear mainly to arise from slow dissociation of CO₂⁺(b⁴Π_u) formed following electron capture by the ground state of the dication reactant (X³Σ_g⁻), with possible contributions from electron capture by higher triplet excited states of the dication.