通过旋转爬梯优化分子排列和取向
Optimal molecular alignment and orientation through rotational ladder climbing
摘要：
在线性刚性转子模型中，研究了电磁场对分子排列和取向的控制。借助单调收敛算法，我们发现最佳场在光谱的微波部分，并且通过从基态逐渐共振激发分子的旋转来起作用，即，通过旋转爬梯这种机制不仅在最大化定向或对准时存在，而且在使用同时优化定向/对准的效率及其持续时间的规定目标状态时也存在。扩展的优化方法考虑有限的旋转温度也提出。
英文摘要：
We study the control by electromagnetic fields of molecular alignment and orientation, in a linear, rigid rotor model. With the help of a monotonically convergent algorithm, we find that the optimal field is in the microwave part of the spectrum and acts by resonantly exciting the rotation of the molecule progressively from the ground state, i.e., by rotational ladder climbing. This mechanism is present not only when maximizing orientation or alignment, but also when using prescribed target states that simultaneously optimize the efficiency of orientation/alignment and its duration. The extension of the optimization method to consider a finite rotational temperature is also presented.
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