线偏振laser场检测分子手性
Detecting chirality in molecules by linearly polarized laser fields
摘要：
提出了一种利用一对线偏振互偏超短脉冲激光区分手性分子对映体的新方案。该技术依赖于这样一个事实，即两个对映体的非对角各向异性贡献的电极化张量具有不同的符号。利用这一性质，我们能够激发两个对映体的相干单向旋转与π相位差的分子电偶极矩。该方法是强大的，适用于相对较高的温度下的分子样品，使其适用于选择性手性分析的混合物，并与对映异构体之间的低障碍的手性分子。作为一个例子，我们提出了纳秒激光驱动的四原子非刚性手性分子的短寿命的手征动力学。所提出的技术的超快时间尺度是非常适合于研究宇称破坏的分子系统在短寿命的手征状态。
英文摘要：
A new scheme for enantiomer differentiation of chiral molecules using a pair of linearly polarized intense ultrashort laser pulses with skewed mutual polarization is presented. The technique relies on the fact that the off-diagonal anisotropic contributions to the electric polarizability tensor for two enantiomers have different signs. Exploiting this property, we are able to excite a coherent unidirectional rotation of two enantiomers with a π phase difference in the molecular electric dipole moment. The approach is robust and suitable for relatively high temperatures of molecular samples, making it applicable for selective chiral analysis of mixtures, and to chiral molecules with low barriers between enantiomers. As an illustration, we present nanosecond laser-driven dynamics of a tetratomic non-rigid chiral molecule with short-lived chirality. The ultrafast time scale of the proposed technique is well suited to study parity violation in molecular systems in short-lived chiral states.
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