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arXiv 2009.09783physics.chem-ph
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库仑爆炸成像法检测空间取向分子的旋向性

Detecting handedness of spatially oriented molecules by Coulomb explosion imaging

Cem Saribal, Alec Owens, Andrey Yachmenev, Jochen Küpper

摘要:

提出了一种新的检测气相手性的方法:在中等强度的椭圆偏振激光场作用下,手性分子在三维空间中排列。激光诱导库仑爆炸产生的带电碎片的动量分布显示出明显的三维取向,当激光偏振椭圆相对于检测器平面的范数向量旋转非直角时。由此产生的速度-图-像不对称性直接与对映体过量和分子的绝对手性有关。我们证明了我们的计划计算樟脑(C10 H16 O),其甲基作为标记片段,使用量子力学模拟面向实验可行的条件。计算对映体过量的灵敏度与其他现代手性方法相当。本方法可以很容易地优化任何手性分子与各向异性的极化率张量通过调整的偏振状态和强度分布的激光场。

英文摘要:

We present a new technique for detecting chirality in the gas phase: Chiral molecules are spatially aligned in three-dimensions by a moderately strong elliptically-polarized laser field. The momentum distributions of the charged fragments, produced by laser-induced Coulomb explosion, show distinct three-dimensional orientation of the enantiomers, when the laser polarization ellipse is rotated by a non-right angle with respect to the norm vector of the detector plane. The resulting velocity-map-image asymmetry is directly connected to the enantiomeric excess and to the absolute handedness of molecules. We demonstrated our scheme computationally for camphor (C10H16O), with its methyl-groups as marker fragments, using quantum-mechanical simulations geared toward experimentally feasible conditions. Computed sensitivity to enantiomeric excess is comparable to other modern chiroptical approaches. The present method can be readily optimized for any chiral molecule with an anisotropic polarizability tensor by adjusting the polarization state and intensity profile of the laser field.

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