实现和应用laser控制分子扭转的实验与理论研究
A combined experimental and theoretical study on realizing and using laser controlled torsion of molecules
摘要：
研究了强激光脉冲作用下3，5-二氟-3 '，5'-二溴联苯（DFDBrBPh）分子的扭转运动。纳秒激光脉冲在空间上对齐立体碳-碳（C-C）键轴，允许垂直偏振的强飞秒脉冲引发伴随着围绕固定轴的旋转的扭转运动。我们通过飞秒时间分辨库仑爆炸成像来监测诱导运动。我们的理论分析证实了实验结果，并在此基础上讨论了激光诱导扭转的未来应用，即，基于扭转分子的去消旋化和激光控制分子结的时间分辨研究。
英文摘要：
It is demonstrated that strong laser pulses can introduce torsional motion in the axially chiral molecule 3,5-diflouro-3',5'-dibromo-biphenyl (DFDBrBPh). A nanosecond laser pulse spatially aligns the stereogenic carbon-carbon (C-C) bond axis allowing a perpendicularly polarized, intense femtosecond pulse to initiate torsional motion accompanied by a rotation about the fixed axis. We monitor the induced motion by femtosecond time-resolved Coulomb explosion imaging. Our theoretical analysis corroborates the experimental findings and on the basis of these results we discuss future applications of laser induced torsion, viz., time-resolved studies of de-racemization and laser controlled molecular junctions based on molecules with torsion.
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