论文标题
通过复合拉曼脉冲的手性分辨率
Chiral resolution by composite Raman pulses
论文作者
论文摘要
我们提出了两种方法，可根据单脉冲和拉曼脉冲对的序列有效检测手性分子。手性分子是通过闭环三态系统建模的，在两个对映异构体的耦合之一中具有不同的符号。一种方法使用三个相互作用步骤的序列：一个脉冲，一个拉曼脉冲和另一个脉冲。另一种方法仅使用两个相互作用步骤的序列：拉曼脉冲和一个脉冲。第二种方法比第一个方法更简单，更快，但需要比第一个方法更复杂的拉曼脉冲。两种技术都可以通过复合脉冲序列代替单个和拉曼脉冲来直接概括。与使用单个脉冲相比，后者具有非常高的信号对比度和实验误差的鲁棒性。我们证明，可以使用恒定旋转（即具有相位补偿）和可变复合（即带相变形）的复合脉冲，前者更准确，后者更简单，更快。
We present two methods for efficient detection of chiral molecules based on sequences of single pulses and Raman pulse pairs. The chiral molecules are modelled by a closed-loop three-state system with different signs in one of the couplings for the two enantiomers. One method uses a sequence of three interaction steps: a single pulse, a Raman pulse, and another single pulse. The other method uses a sequence of only two interaction steps: a Raman pulse, and a single pulse. The second method is simpler and faster but requires a more sophisticated Raman pulse than the first one. Both techniques allow for straightforward generalizations by replacing the single and Raman pulses with composite pulse sequences. The latter achieve very high signal contrast and far greater robustness to experimental errors than by using single pulses. We demonstrate that both constant-rotation (i.e., with phase compensation) and variable-rotation (i.e., with phase distortion) composite pulses can be used, the former being more accurate and the latter being simpler and faster.
