Contrasting Dynamics in Isoelectronic Anions Formed by Electron Attachment,The Journal of Physical Chemistry Letters

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Contrasting Dynamics in Isoelectronic Anions Formed by Electron Attachment
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2024-01-19 , DOI: 10.1021/acs.jpclett.3c03460
P Nag ₁ , M Ranković ₁ , M Polášek ₁ , R Čurík ₁ , D S Slaughter ₂ , J Fedor ₁

Affiliation

Cyanogen NCCN and cyanoacetylene HCCCN are isoelectronic molecules, and as such, they have many similar properties. We focus on the bond cleavage in these induced by the dissociative electron attachment. In both molecules, resonant electron attachment produces CN^– with very similar energy dependence. We investigate the very different dissociation dynamics, in each of the two molecules, revealed by velocity map imaging of this common fragment. Different dynamics are manifested both in the excess energy partitioning and in the angular distributions of fragments. Based on the comparison with electron energy loss spectra, which provide information about possible parent states of the resonances (both optically allowed and forbidden excited states of the neutral target), we ascribe the observed effect to the distortion of the nuclear frame during the formation of core-excited resonance in cyanoacetylene. The proposed mechanism also explains a puzzling difference in the magnitude of the CN^– cross section in the two molecules which has been so far unexplained.

中文翻译：

电子附着形成的等电子阴离子的动力学对比

氰NCCN和氰乙炔HCCCN是等电子分子，因此它们具有许多相似的性质。我们重点关注由离解电子附着引起的键断裂。在这两种分子中，共振电子附着都会产生 CN ^-具有非常相似的能量依赖性。我们研究了两个分子中非常不同的解离动力学，通过该共同片段的速度图成像揭示了这一点。不同的动力学表现在过剩能量分配和碎片角度分布上。基于与电子能量损失谱的比较，电子能量损失谱提供了有关共振的可能母态（中性目标的光学允许和禁止激发态）的信息，我们将观察到的效应归因于形成过程中核框架的扭曲。氰基乙炔中的核激发共振。所提出的机制还解释了两个分子中^CN截面大小的令人费解的差异，这一差异迄今为止尚未得到解释。

更新日期：2024-01-19

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