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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Photodissociation dynamics of ethyltoluene and p-fluoroethylbenzene at 193 and 248 nm
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Photodissociation dynamics of ethyltoluene and p-fluoroethylbenzene at 193 and 248 nm

机译：乙基甲苯和对氟乙苯在193和248 nm处的光解离动力学

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摘要

Photodissociation of jet-cooled o-, m-, and p-ethyltoluene and p-fluoroethylbenzene at both 193 and 248 run was studied separately using vacuum ultraviolet photoionization/multimass ion imaging techniques. Dissociation occurs exclusively through alkyl chain C-C bond cleavage. The measured photofragment translational energy distributions at 193 nm decrease monotonically with increasing translational energy. The distributions indicate that dissociation occurs from the ground electronic state after internal conversion. However, the photofragment translational energy distributions from o-, in-, and p-ethyltoluene obtained at 248 nm contain a slow and a fast component; the ratios between these components are 1:4, 1:1.3, and 1:6, respectively. On the other hand, only the slow component was observed from p-fluoroethylbenzene at 248 nm. The fast components are attributed to the dissociation from the triplet state after intersystem crossing, and the slow components result from the dissociation in the ground electronic state. Comparison with the photodissociation of benzene and toluene and ab initio calculation has been made.
机译：使用真空紫外光电离/多质量离子成像技术分别研究了喷气冷却的邻，间和对乙基甲苯与对氟乙基苯在193和248处的光解离。离解仅通过烷基链C-C键裂解发生。随着平移能量的增加，在193 nm处测得的光碎片平移能量分布单调减少。分布表明在内部转换后从基态电子发生了离解。但是，在248 nm处从邻，甲苯和对乙基甲苯得到的光碎片段平移能量分布包含缓慢和快速的成分。这些组件之间的比率分别为1：4、1：1.3和1：6。另一方面，在248nm处仅从对氟乙基苯中观察到慢的组分。快速成分归因于系统间交叉后与三重态的解离，而缓慢成分归因于基态电子状态的解离。与苯和甲苯的光解离比较，从头算。

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