Selective preparation of enantiomers by laser pulses: From optimal control to specific pump and dump transitions
Selective preparation of enantiomers by laser pulses: From optimal control to specific pump and dump transitions
复制标题
通过激光脉冲选择性制备对映体：从最佳控制到特定的泵浦和转储转变
DOI：
10.1063/1.1310595
复制
发表时间：
2000
影响因子：
4.4
通讯作者：
Y. Ohtsuki
中科院分区：
文献类型：
--
作者：
L. González;K. Hoki;D. Kröner;A. Leal;J. Manz;Y. Ohtsuki
从最佳控制出发，设计了具有解析形状的各种系列的红外超短激光脉冲，以将预取向的分子从其基态扭转状态（其代表左右阻转异构体的相干叠加）驱动到单一对映异构体。仔细分析的人口动力学，连同潜在的激光诱导跃迁的对称性选择规则，产生的机制。也就是说，分子从其基态振动态通过具有相反对称性的激发扭转态的双峰被驱动朝向最低双峰态的相干叠加。这种泵浦和转储机制可以通过更简单的分析激光脉冲系列来实现。这种分解的最佳脉冲分析子脉冲，使我们能够设计不同的方案，选择性制备左或右对映体。示例性的，这是证明了代表性的波包的扭转运动的量子模拟…
Starting from optimal control, various series of infrared, ultrashort laser pulses with analytical shapes are designed in order to drive a preoriented molecule from its ground torsional state, which represents the coherent superposition of left and right atropisomers, towards a single enantiomer. Close analysis of the population dynamics, together with the underlying symmetry selection rules for the laser induced transitions, yields the mechanism. Namely, the molecule is driven from its ground vibrational state towards the coherent superposition of the lowest doublet of states via a doublet of excited torsional states with opposite symmetries. This pump-and-dump mechanism can be achieved by simpler series of analytical laser pulses. This decomposition of the optimal pulse into analytical subpulses allows us to design different scenarios for the selective preparation of left or right enantiomers. Exemplary this is demonstrated by quantum simulations of representative wave packets for the torsional motions ...