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arXiv physics/0212078physics.chem-ph
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分子排列和定向:从Laser诱导机制到最优控制

Molecular Alignment and Orientation: From Laser-Induced Mechanisms to Optimal Control

O. Atabek, C. M. Dion

摘要:

遗传算法,作为最优控制策略的实现,目前已成功地利用在分子物理学的广泛的问题。在这种情况下,激光控制的分子排列和取向仍然是一个非常有前途的问题,具有挑战性的应用从化学反应扩展到纳米级设计。我们强调基本量子机制监测对齐/取向过程和最佳控制方案之间的互补性。更明确地说,如果一方面,我们可以帮助最优控制方案,以利用这些机制,适当地建立目标和划定的参数采样空间,另一方面,我们希望学习,从最优控制的结果,一些强大的和物理上健全的动力学机制。我们提出的基本机制的对齐和取向,如由分子加场的有效势和“踢”机制获得的突然激发所容纳的摆动状态。非常有趣的是,一个最佳的控制方案的方向,基于遗传算法,也导致了一个突然的脉冲场轴承踢机制的特征。我们的未来前景包括实现高效、持久定位的最佳脉冲整形以及对温度影响的鲁棒性。

英文摘要:

Genetic algorithms, as implemented in optimal control strategies, are currently successfully exploited in a wide range of problems in molecular physics. In this context, laser control of molecular alignment and orientation remains a very promising issue with challenging applications extending from chemical reactivity to nanoscale design. We emphasize the complementarity between basic quantum mechanisms monitoring alignment/orientation processes and optimal control scenarios. More explicitly, if on one hand we can help the optimal control scheme to take advantage of such mechanisms by appropriately building the targets and delineating the parameter sampling space, on the other hand we expect to learn, from optimal control results, some robust and physically sound dynamical mechanisms. We present basic mechanisms for alignment and orientation, such as pendular states accommodated by the molecule-plus-field effective potential and the "kick" mechanism obtained by a sudden excitation. Very interestingly, an optimal control scheme for orientation, based on genetic algorithms, also leads to a sudden pulsed field bearing the characteristic features of the kick mechanism. Optimal pulse shaping for very efficient and long-lasting orientation, together with robustness with respect to temperature effects, are among our future prospects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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