Communication: XUV transient absorption spectroscopy of iodomethane and iodobenzene photodissociation
Communication: XUV transient absorption spectroscopy of iodomethane and iodobenzene photodissociation
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DOI：
10.1063/1.4955212
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发表时间：
2016-07-07
影响因子：
4.4
通讯作者：
Mikosch, J.
中科院分区：
文献类型：
--
作者：
Drescher, L.;Galbraith, M. C. E.;Mikosch, J.
利用高次谐波产生的飞秒紫外泵浦脉冲和XUV探针脉冲，建立了碘甲烷和碘苯在n -4、N-5前边缘处光解的时间分辨极紫外（XUV）瞬态吸收光谱。对于这两种分子，在泵浦探针的时间分辨率范围内，分子核价吸收线立即消失。向碘原子产物收敛的吸收谱线在CH3I中迅速出现，而在C6H5I中则延迟出现。我们将这种延迟归因于碘苯中初始的pi -> sigma*激发，它远离碘报告原子。我们测量了CH3I中出现的原子吸收线的能量连续变化，这归因于受激价壳层的弛豫。一个独立的粒子模型被用来合理化观察到的实验结果。AIP出版社出版。
Time-resolved extreme ultraviolet (XUV) transient absorption spectroscopy of iodomethane and iodobenzene photodissociation at the iodine pre-N-4,N-5 edge is presented, using femtosecond UV pump pulses and XUV probe pulses from high harmonic generation. For both molecules the molecular core-to-valence absorption lines fade immediately, within the pump-probe time-resolution. Absorption lines converging to the atomic iodine product emerge promptly in CH3I but are time-delayed in C6H5I. We attribute this delay to the initial pi -> sigma* excitation in iodobenzene, which is distant from the iodine reporter atom. We measure a continuous shift in energy of the emerging atomic absorption lines in CH3I, attributed to relaxation of the excited valence shell. An independent particle model is used to rationalize the observed experimental findings. Published by AIP Publishing.