Dissociative electron attachment to acetaldehyde, CH3CHO. A laboratory study using the velocity map imaging technique.
Dissociative electron attachment to acetaldehyde, CH3CHO. A laboratory study using the velocity map imaging technique.
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DOI：
10.1039/c2cp42966g
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发表时间：
2013-01
期刊：
影响因子：
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通讯作者：
E. Szymańska;V. Prabhudesai;N. Mason;E. Krishnakumar
中科院分区：
文献类型：
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作者：
E. Szymańska;V. Prabhudesai;N. Mason;E. Krishnakumar
对乙醛（CH(3)CHO）的解离电子附着（DEA）过程进行了详细的实验研究。为了研究这一过程，我们使用了飞行时间光谱仪和速度切片成像技术。发现CH(3)CHO中的DEA在6 ~ 13 eV的电子能量范围内通过散射共振产生CH(3)（-）、O（-）、OH（-）、C(2)H（-）、C(2)HO（-）和CH(3)CO（-）阴离子产物。在这些产物离子中，只有O（-）形成，具有任何可测量的动能分布，表明两体解离过程。CH(3)CO（-）虽然以很低的动能形成，但在速度切片图像上显示出各向异性，表明H原子相对于电子束在180°方向射出。其他产物离子的低动能分布和无各向异性的角分布表明它们是由瞬态分子负离子的多次破碎形成的。从各部分波的角度分析了O（-）的角分布。
A detailed experimental investigation of the dissociative electron attachment (DEA) process to acetaldehyde, CH(3)CHO is presented. To investigate this process we use a time of flight spectrometer coupled with the velocity slice imaging technique. DEA in CH(3)CHO is found to lead to the formation of CH(3)(-), O(-), OH(-), C(2)H(-), C(2)HO(-) and CH(3)CO(-) anionic products produced through scattering resonances in the electron energy range of 6 to 13 eV. Of these product ions only O(-) is formed with any measurable kinetic energy distribution indicating a two-body dissociation process. CH(3)CO(-), although formed with very low kinetic energy, shows anisotropy in the velocity slice image, indicating ejection of the H atom in the 180° direction with respect to the electron beam. The low kinetic energy distributions and absence of any anisotropy in the angular distributions of the other product ions indicate that they are formed through multiple fragmentation of the transient molecular negative ion. The angular distribution of O(-) is analysed in terms of the various partial waves.