An (e, 2e + ion) study of electron-impact ionization and fragmentation of carbon dioxide clusters,Journal of Physics B: Atomic, Molecular and Optical Physics

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An (e, 2e + ion) study of electron-impact ionization and fragmentation of carbon dioxide clusters
Journal of Physics B: Atomic, Molecular and Optical Physics ( IF 1.5 ) Pub Date : 2021-04-22 , DOI: 10.1088/1361-6455/abef50
Xing Wang _{1,

2} , Hongjing Yang ₁ , Khokon Hossen _{2,

3} , Alexander Dorn ₂ , Xueguang Ren _{1,

2}

Affiliation

We report an experimental study of the electron-impact ionization (E ₀ = 65eV) and fragmentation of carbon dioxide clusters for the formation of ${\mathrm{C}\mathrm{O}}_{2}^{+}$ and ${{\left({\mathrm{C}\mathrm{O}}_{2}\right)}_{2}}^{+}$ using a reaction microscope. All three charged particles, two outgoing electrons and one cation, are detected in coincidence such that the momentum vectors and, consequently, the kinetic energies for these final-state particles are determined. The reaction mechanisms correlated to ionic species are analyzed using the measured binding energy spectra over a broad range of ionization energy (8–32eV). We observe that the ${{\left({\mathrm{C}\mathrm{O}}_{2}\right)}_{2}}^{+}$ cations with small momenta are formed mainly from the direct ionization of the outermost 1π _g orbital in the carbon dioxide dimer (CO₂)₂. While the (1π _u)⁻¹, (3σ _u)⁻¹ and (4σ _g)⁻¹ states in ${{\left({\mathrm{C}\mathrm{O}}_{2}\right)}_{2}}^{+}$ are unstable and most likely dissociate into ${\mathrm{C}\mathrm{O}}_{2}^{+}$ and neutral species. The ${{\left({\mathrm{C}\mathrm{O}}_{2}\right)}_{2}}^{+}$ cations with high momenta are attributed to the ionization of small carbon dioxide clusters (CO₂)_n (n ⩾ 3) and subsequent dissociation processes. Compared to the appearance energy studies of carbon dioxide clusters where only the outermost 1π _g orbital ionization was observed for formation of ${{\left({\mathrm{C}\mathrm{O}}_{2}\right)}_{2}}^{+}$ , several additional channels are identified in this work.

中文翻译：

(e, 2e + ion) 研究二氧化碳簇的电子撞击电离和碎裂

我们报告了电子碰撞电离 ( E ₀ = 65eV) 和二氧化碳簇的碎裂的实验研究，以形成 ${\mathrm{C}\mathrm{O}}_{2}^{+}$ 和 ${{\left({\mathrm{C}\mathrm{O}}_{2}\right)}_{2}}^{+}$ 使用反应显微镜。所有三个带电粒子，两个出射电子和一个阳离子，都被同时检测到，从而确定了这些最终状态粒子的动量矢量和动能。使用测量的结合能谱在广泛的电离能 (8-32eV) 范围内分析与离子种类相关的反应机制。我们观察到 ${{\left({\mathrm{C}\mathrm{O}}_{2}\right)}_{2}}^{+}$ 与小动量阳离子主要形成从最外层1的直接电离π _克轨道中的二氧化碳二聚体（CO ₂) ₂ . 而 (1 π _u ) ^-1、(3 σ _u ) ^-1和 (4 σ _g ) ^-1状态是不稳定的并且很可能分解为中性物种。具有高动量的阳离子归因于小二氧化碳簇 (CO ₂ ) _n ( n ⩾ 3) 的电离和随后的解离过程。与二氧化碳簇的出现能量研究相比，仅观察到最外层 1 π _g轨道电离形成 ${{\left({\mathrm{C}\mathrm{O}}_{2}\right)}_{2}}^{+}$ ${\mathrm{C}\mathrm{O}}_{2}^{+}$ ${{\left({\mathrm{C}\mathrm{O}}_{2}\right)}_{2}}^{+}$ ${{\left({\mathrm{C}\mathrm{O}}_{2}\right)}_{2}}^{+}$ ，在这项工作中确定了几个额外的渠道。

更新日期：2021-04-22

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