Deconvoluting nonaxial recoil in Coulomb explosion measurements of molecular axis alignment
Deconvoluting nonaxial recoil in Coulomb explosion measurements of molecular axis alignment
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DOI：
10.1103/physreva.94.023410
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发表时间：
2016-08-15
影响因子：
2.9
通讯作者：
Stapelfeldt, Henrik
中科院分区：
文献类型：
--
作者：
Christensen, Lauge;Christiansen, Lars;Stapelfeldt, Henrik
本文定量研究了激光定向分子库仑爆炸中非轴反冲效应的影响，并介绍了一种消除非轴反冲效应对碎片离子角分布模糊的方法。模拟结果表明，非轴向反冲影响的碎片离子的发射方向之间的相关性不同的效果所造成的不完善的分子排列。该方法基于库仑爆炸碎片离子发射方向之间的相关性分析，用于从实验碎片角分布中去卷积非轴反冲效应。然后将去卷积方法应用于一些实验数据集，以校正非轴向反冲的对准程度，以选择用于探测分子对准的最佳库仑爆炸通道，并估计从所选库仑爆炸通道可以观察到的最高对准程度。
We report a quantitative study of the effect of nonaxial recoil during Coulomb explosion of laser-aligned molecules and introduce a method to remove the blurring caused by nonaxial recoil in the fragment-ion angular distributions. Simulations show that nonaxial recoil affects correlations between the emission directions of fragment ions differently from the effect caused by imperfect molecular alignment. The method, based on analysis of the correlation between the emission directions of the fragment ions from Coulomb explosion, is used to deconvolute the effect of nonaxial recoil from experimental fragment angular distributions. The deconvolution method is then applied to a number of experimental data sets to correct the degree of alignment for nonaxial recoil, to select optimal Coulomb explosion channels for probing molecular alignment, and to estimate the highest degree of alignment that can be observed from selected Coulomb explosion channels.