Different Time Scales in the Dissociation Dynamics of Core-Excited CF4 by Two Internal Clocks
Different Time Scales in the Dissociation Dynamics of Core-Excited CF4 by Two Internal Clocks
复制标题
两个内部时钟对核激发 CF4 解离动力学的不同时间尺度
DOI：
10.1103/physrevlett.119.203203
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发表时间：
2017
影响因子：
8.6
通讯作者：
M.N. Piancastelli and E. Shigemasa
中科院分区：
文献类型：
--
作者：
H. Iwayama;C. Leonard;F. Le Quere;S. Carniato;R. Guillemin;M. Simon;M.N. Piancastelli and E. Shigemasa
本文利用俄歇电子-光离子符合，从碎片的角分布出发，分析了在未占据分子轨道核激发下的碎片过程。不同的时间尺度已经被启发，这对应于超快碎裂，在几个飞秒尺度上，分子没有时间旋转，碎片根据核心激发物质的维持取向发射，或者共振俄歇衰变后的解离，分子在重新恢复随机取向之前仍然保持一些激发过程的记忆。势能面的地面，核心激发，和最终状态已计算在theab initiolevel，这表明中性激发态的解离性质，导致超快解离，以及解离性质的一些最终离子状态后达到共振俄歇衰变，产生相同的片段在一个更长的时间尺度。
Fragmentation processes following Cunoccupied molecular orbital core excitations inhave been analyzed on the ground of the angular distribution of theemitted fragments by means of Auger electron-photoion coincidences. Different time scales have been enlightened, which correspond to either ultrafast fragmentation, on the few-femtosecond scale, where the molecule has no time to rotate and the fragments are emitted according to the maintained orientation of the core-excited species, or dissociation after resonant Auger decay, where the molecule still keeps some memory of the excitation process before reassuming random orientation. Potential energy surfaces of the ground, core-excited, and final states have been calculated at theab initiolevel, which show the dissociative nature of the neutral excited state, leading to ultrafast dissociation, as well as the also dissociative nature of some of the final ionic states reached after resonant Auger decay, yielding the same fragments on a much longer time scale.