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Semiclassical hybrid approach to condensed phase molecular dynamics: Application to the I_2Kr_(17) cluster

机译:半经典混合方法的凝聚相分子动力学:在I_2Kr_(17)簇中的应用

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摘要

We study the vibrational decoherence dynamics of an iodine molecule in a finite krypton cluster comprising the first solvation shell. A normal mode analysis allows us to successively increase the complexity of the description. For the ground state dynamics, comparison with experimental matrix results shows that already four degrees of freedom are sufficient to capture the main decoherence mechanism. For electronically excited iodine, we model the vibrational dynamics of initial Schr?dinger cat-like states by the semiclassical hybrid dynamics [ Grossmann, F.J. Chem. Phys. 2006, 125, 014111 ] and full quantum calculations, where available. Good agreement of the results is found for a reduced model with three degrees of freedom. We find non-Gaussian distortions of the bath density matrix, which is a necessary condition, if Schr?dinger catlike states in the bath are to be identified. However, in contrast to the experiment [ Segale, D.; et al. J. Chem. Phys. 2005, 122, 111104 ], we observe only incoherent superpositions of bath vibrational states.
机译:我们研究了碘分子在包括第一溶剂化壳的有限shell簇中的振动退相干动力学。正常模式分析使我们能够逐步增加描述的复杂性。对于基态动力学,与实验矩阵结果的比较表明,已经有四个自由度足以捕获主要的退相干机制。对于电子激发的碘,我们通过半经典混合动力学对初始薛定ding猫状态的振动动力学进行建模[Grossmann,F.J. Chem。物理2006,125,014111]和完整的量子计算(如果有)。对于具有三个自由度的简化模型,发现了与结果的良好一致性。我们发现浴密度矩阵的非高斯失真,这是必要条件,如果要确定浴中的薛定r猫状状态。但是,与实验相反[Segale,D .;等。 J.化学物理2005,122,111104],我们仅观察到浴液振动状态的非相干叠加。

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