Two-body fragmentation dynamics of C2H22 by electron impact: Disentangling vinylidene decarbonation from symmetric breakup
Two-body fragmentation dynamics of C2H22 by electron impact: Disentangling vinylidene decarbonation from symmetric breakup
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电子碰撞引起的 C2H2^2 的二体裂解动力学：从对称裂解中解开亚乙烯基脱碳
DOI：
10.1103/physreva.100.062707
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发表时间：
2019
影响因子：
2.9
通讯作者：
Chen Xiangjun
中科院分区：
文献类型：
--
作者：
Chen Lei;Shan Xu;Wang Enliang;Ren Xueguang;Zhao Xi;Huang Weizhe;Chen Xiangjun
本文报道了利用离子动量成像谱仪对1 keV电子碰撞引起的两体碎裂的实验研究。通过离子-离子符合测量，在飞行时间（TOF）相关图中，解离通道（去质子化）和解离通道（形成）被直接识别，而对称断裂通道和偏乙烯基去碳酸化通道没有被很好地分离。在这项工作中，通过利用动能释放（KER）的解离角的独立性，我们能够从TOF图解开事件。因此，推导出所有四个碎裂通道的KER分布，并从测量中精确地确定相对分支比。通过比较测得的KER值与先前计算的势能面，裂解通道的路径被分配。
We report experimental investigations of two-body fragmentation ofinduced by 1 keV electron collision utilizing an ion momentum imaging spectrometer. With the ion-ion coincidence measurement, dissociation channels(deprotonation) and(formation) are directly identified, while the symmetric breakupchannel and vinylidene decarbonationchannel are not well separated in the measured time-of-flight (TOF) correlation map. In this work, by taking advantage of the independence of kinetic energy release (KER) on the dissociation angle, we are able to disentangle the events from the TOF map. Consequently, KER distributions for all four fragmentation channels are deduced, and the relative branching ratios are precisely determined from the measurements. By comparing the measured KER values with the previous calculated potential energy surfaces, pathways for the fragmentation channels are assigned.