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Fewest-switches surface hopping and decoherence in multiple dimensions

机译:在多个维度上进行最少的表面跳变和去相干

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摘要

In a recent article (Subotnik, J. E.; Shenvi, N. J. Chem. Phys.2011, 134, 24105), we introduced a new approach for incorporating decoherence into the fewest-switches surface-hopping (FSSH) algorithm, titled augmented FSSH (A-FSSH). The A-FSSH algorithm was designed to correct the well-known overcoherence problem in traditional FSSH, and thus allow wave packets on different surfaces to separate naturally subject to different forces. As presented earlier, however, the A-FSSH algorithm was restricted to two electronic states. We now extend the method to more than two electronic states and present several new model problems with multiple electronic and nuclear dimensions. Lastly, starting with the quantum Liouville equation, we rederive and implement the new phase correction suggested by Shenvi (Shenvi, N.; Subotnik, J. E.; Yang, W. J. Chem. Phys.2011, 135, 24101) and co-workers for propagating the electronic amplitude along a specified nuclear trajectory and find much improved results in certain cases.
机译:在最近的文章(Subotnik,JE; Shenvi,NJ Chem。Phys.2011,134,24105)中,我们介绍了一种将去相干性纳入最少的交换机表面跳变(FSSH)算法的新方法,称为增强FSSH(A- FSSH)。 A-FSSH算法旨在纠正传统FSSH中众所周知的过相干问题,从而使不同表面上的波包在受到不同作用力的情况下自然分离。但是,如前所述,A-FSSH算法仅限于两种电子状态。现在,我们将该方法扩展到两个以上的电子状态,并提出了多个具有多个电子和核尺寸的新模型问题。最后,从量子Liouville方程开始,我们重新制定并实施由Shenvi(Shenvi,N .; Subotnik,JE; Yang,WJ Chem。Phys.2011,135,24101)和同事推广的新相位校正。沿特定核轨迹的电子振幅,并在某些情况下发现大大改善的结果。

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