论文标题
通过库仑爆炸成像来检测空间定向分子的手
Detecting handedness of spatially oriented molecules by Coulomb explosion imaging
论文作者
论文摘要
我们提出了一种用于在气相中检测手性的新技术：手性分子通过中等强度强的椭圆极极化的激光场在三维中空间排列。激光诱导的库仑爆炸产生的带电片段的动量分布显示出对映异构体的不同三维取向，当激光极化椭圆相对于检测器平面的标准矢量，激光极化椭圆旋转。所得的速度映射图像不对称直接连接到对映体的过量和分子的绝对手段。我们使用针对实验可行的条件的量子力学模拟，以其甲基组为标记片段，以甲基组作为标记片段为樟脑（C10H16O）进行计算。对对映体多余的计算敏感性与其他现代手势方法相媲美。通过调节激光场的极化状态和强度曲线，可以轻松地针对具有各向异性极化张量的任何手性分子进行优化。
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.
