Photodissociation dynamics of CH3I probed via multiphoton ionisation photoelectron spectroscopy.

Photodissociation dynamics of CH3I probed via multiphoton ionisation photoelectron spectroscopy.
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通过多光子电离光电子能谱探测 CH3I 的光解离动力学。

DOI:
10.1039/c9cp01477b
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发表时间:
2019
期刊:
PCCP
影响因子:
--
通讯作者:
Warne EM
Warne EM
中科院分区:
--
文献类型:
--
作者:
Warne EM

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在A带吸收峰的红(269 nm)和蓝(255 nm)侧研究了CH3I的解离动力学。在时间分辨光电子成像实验中使用多光子电离探针,我们在两个波长处观察到非常不同的动态,在测量的寿命和动态结构中具有显着差异。的差异解释在可访问的3Q0和1Q1状态的激发截面的变化和随后的动态上的每一个。的测量支持现有的文献上的快速解离动力学的红色侧的吸收最大值在269 nm,这是占主导地位的动态沿着3Q0状态。在255 nm,我们观察到类似的动态沿着的3Q0状态,但也有显着的贡献,从1Q1状态。沿着1Q1电位的动力学在光电子能谱中显示出更复杂的结构和显著增加的寿命,指示更复杂的反应途径。
The dissociation dynamics of CH3I is investigated on the red (269 nm) and blue (255 nm) side of the absorption maximum of the A-band. Using a multiphoton ionisation probe in a time-resolved photoelectron imaging experiment we observe very different dynamics at the two wavelengths, with significant differences in the measured lifetime and dynamic structure. The differences are explained in terms of changes in excitation cross-sections of the accessible 3Q0 and 1Q1 states and the subsequent dynamics upon each of them. The measurements support the existing literature on the rapid dissociation dynamics on the red side of the absorption maximum at 269 nm which is dominated by the dynamics along the 3Q0 state. At 255 nm we observe similar dynamics along the 3Q0 state but also a significant contribution from the 1Q1 state. The dynamics along the 1Q1 potential show a more complex structure in the photoelectron spectrum and a significantly increased lifetime, indicative of a more complex reaction pathway.
对齐的CH(3)I和C(6)H(3)F(3)F(2)I分子的光解离,该分子用位点选择性的极端紫外线离子化探测了时间分辨的库仑爆炸成像。
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