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Breaking dynamic inversion symmetry in a racemic mixture using simple trains of laser pulses

机译:使用简单的激光脉冲列车破坏外消旋混合物的动态反转对称

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Recent advances in ultrafast laser technology hint at the possibility of using shaped pulses to generate deracemization via selective enantiomeric conversion; however, experimental implementation remains a challenge and has not yet been achieved. Here, we describe an experiment that can be considered an accessible intermediate step on the road towards achieving laser induced deracemization in a laboratory. Our approach consists of driving a racemic mixture of 3D oriented 3,5-difluoro-3', 5'- dibromobiphenyl ( F2H3C6-C6H3Br2) molecules with a simple train of Gaussian pulses with alternating polarization axes. We use arguments related to the geometry of the field/molecule interaction to illustrate why this will increase the amplitude of the torsional oscillations between the phenyl rings while simultaneously breaking the inversion symmetry of the dynamics between the left-and right-handed enantiomeric forms, two crucial requirements for achieving deracemization. We verify our approach using numerical simulations and show that it leads to significant and experimentally measurable differences in the internal enantiomeric structures when detected by Coulomb explosion imaging.
机译:超快激光技术提示的最新进展在使用异形脉冲以通过选择性对映体转换产生稀释剂的可能性;然而,实验实施仍然是一个挑战,尚未实现。在这里,我们描述了一种实验,该实验可以被认为是在实验室中实现激光诱导的终止道路的可访问中间步骤。我们的方法包括驱动3D取向的3,5-二氟-3',5'-二溴硼苯基(F2H3C6-C6H3BR2)分子的外消旋混合物,其具有简单的高斯脉冲的简单列脉冲,具有交替的偏振轴。我们使用与现场/分子相互作用的几何形状相关的争论来说明为什么这将增加苯环之间的扭转振荡的幅度,同时破坏左右右手对映体形式之间动态的反转对称性实现终止的关键要求。我们使用数值模拟验证了我们的方法,并表明它在由库仑爆炸成像检测到时,它导致内部对映射结构的显着和实验可测量的差异。

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