A new technique for probing chirality via photoelectron circular dichroism.

A new technique for probing chirality via photoelectron circular dichroism.
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通过光电子圆二色性探测手性的新技术。

DOI:
10.1016/j.aca.2017.06.051
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发表时间:
2017
影响因子:
6.2
通讯作者:
Miles J
Miles J
中科院分区:
化学1区
文献类型:
--
作者:
Miles J

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我们提出了一种基于多光子光电子圆二向色性的手性对映体鉴别的原理证明方法。一种新型的立体探测装置被用来测量手性分子在平行或反平行于电离飞秒激光脉冲的传播方向上发射的光电子的数量。在这项研究中,我们展示了酮、樟脑和芬香酮中的这些不对称性如何依赖于激光脉冲的椭圆度和样品的对映体过量。通过使用高重复频率的飞秒激光,可以接近实时地测量对映体过量,不确定度在几个百分比的水平上。由于仪器紧凑,商业交钥匙飞秒激光很容易获得,现在有可能为一系列应用开发独立的手性分析仪器。
We present a proof-of-principle approach for discriminating chiral enantiomers based on the phenomenon of multiphoton photoelectron circular dichroism. A novel stereo detection setup was used to measure the number of photoelectrons emitted from chiral molecules in directions parallel or anti-parallel to the propagation of the ionising femtosecond laser pulses. In this study, we show how these asymmetries in the ketones camphor and fenchone depend upon the ellipticity of the laser pulses and the enantiomeric excess of the sample. By using a high repetition rate femtosecond laser, enantiomer excesses with uncertainties at the few-percent level could be measured in close to real-time. As the instrument is compact, and commercial turnkey femtosecond lasers are readily available, the development of a stand-alone chiral analysis instrument for a range of applications is now possible.
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发表时间: 2014-05-07
期刊: PHYSICAL REVIEW A
影响因子: 2.9
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