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arXiv 2106.08145physics.chem-ph
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萘热基态阳离子的振动弛豫

Vibrational relaxation of hot ground state cations of naphthalene

Geert Reitsma, Serguei Patchkovskii, Judith Dura, Lorenz Drescher, Jochen Mikosch, Marc J. J. Vrakking, Oleg Kornilov

摘要:

时间分辨XUV-IR光离子质谱的萘进行了宽带,以及与波长选择的窄带XUV脉冲揭示了一个上升的概率的碎片特征的寿命为$92\pm4$ ~fs。该寿命与XUV激发波长无关,并且对于实验中记录的所有低外观能量碎片都是相同的。结合统计的多状态振动模型的实验数据的分析表明,实验信号跟踪振动能量重新分配的势能面的基态阳离子。特别是,人口的面外环扭曲和面外波弯曲模式可能是负责打开新的IR吸收通道,导致增强的碎裂。

英文摘要:

Time-resolved XUV-IR photoion mass spectroscopy of naphthalene conducted with broadband, as well as with wavelength-selected narrowband XUV pulses reveals a rising probability of fragmentation characterized by a lifetime of $92\pm4$~fs. This lifetime is independent of the XUV excitation wavelength and is the same for all low appearance energy fragments recorded in the experiment. Analysis of the experimental data in conjunction with a statistical multi-state vibronic model suggests that the experimental signals track vibrational energy redistribution on the potential energy surface of the ground state cation. In particular, populations of the out-of-plane ring twist and the out-of-plane wave bending modes could be responsible for opening new IR absorption channels leading to enhanced fragmentation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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