Visualizing recurrently migrating hydrogen in acetylene dication by intense ultrashort laser pulses
Visualizing recurrently migrating hydrogen in acetylene dication by intense ultrashort laser pulses
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DOI：
10.1103/physrevlett.99.258302
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发表时间：
2007-12-21
影响因子：
8.6
通讯作者：
Takahashi, Eiji J.
中科院分区：
文献类型：
--
作者：
Hishikawa, Akiyoshi;Matsuda, Akitaka;Takahashi, Eiji J.
我们通过采用亚 10 飞秒强激光脉冲（9 fs、0.13 PW/cm(2)、800 nm）的泵浦探针库仑爆炸成像，展示了氘代乙炔双标 (C(2)D(2)(2+)）中超快氢迁移的可视化。从三体爆炸产生的碎片离子动量的时间演化来看，C(2)D(2)(3+) -> D(+)+C(+)+CD(+)，迁移以循环方式进行：氘原子首先在很短的时间尺度（类似于 90 fs）内从一个碳位点转移到另一个碳位点，然后在 280 fs 的时间内迁移回原来的碳位点，与分子解离。
We demonstrate the visualization of ultrafast hydrogen migration in deuterated acetylene dication (C(2)D(2)(2+)) by employing the pump-probe Coulomb explosion imaging with sub-10-fs intense laser pulses (9 fs, 0.13 PW/cm(2), 800 nm). It is shown, from the temporal evolution of the momenta of the fragment ions produced by the three-body explosion, C(2)D(2)(3+) -> D(+)+C(+)+CD(+), that the migration proceeds in a recurrent manner: The deuterium atom first shifts from one carbon site to the other in a short time scale (similar to 90 fs) and then migrates back to the original carbon site by 280 fs, in competition with the molecular dissociation.