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arXiv 0707.1004physics.chem-ph
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质子化水-二聚体II的全维量子动力学模拟:红外光谱和振动动力学

Full dimensional (15D) quantum-dynamical simulation of the protonated water-dimer II: infrared spectrum and vibrational dynamics

Oriol Vendrell, Fabien Gatti, Hans-Dieter Meyer

摘要:

质子化水二聚体(H5 O2+)的红外吸收光谱在光谱范围0-4000 cm-1内以全维(15 D)模拟。使用多组态时间相关哈特里(MCTDH)方法进行波包的传播的计算。所有的基本面和几个泛音的振动运动计算。H5 O2+的光谱在很大程度上是由质子转移运动与水分子的大幅度流动运动、水弯曲和水-水拉伸运动的耦合而形成的。这些耦合被识别和讨论,并指定相应的谱线。然而,H5 O2+所具有的大耦合并不妨碍通过明确定义的简单振动类型(拉伸、弯曲等)来描述耦合振动运动。基于明确定义的振动模式,谱线是根据这些振动模式指定的。我们的结果比较最近的实验和计算系统上给出。报道的MCTDH IR光谱与Hammer等人最近测量的光谱非常一致[JCP,122,244301,(2005)]。

英文摘要:

The infrared absorption spectrum of the protonated water dimer (H5O2+) is simulated in full dimensionality (15D) in the spectral range 0-4000 cm-1. The calculations are performed using the Multiconfiguration Time-Dependent Hartree (MCTDH) method for propagation of wavepackets. All the fundamentals and several overtones of the vibrational motion are computed. The spectrum of H5O2+ is shaped to a large extent by couplings of the proton-transfer motion to large amplitude fluxional motions of the water molecules, water bending and water-water stretch motions. These couplings are identified and discussed, and the corresponding spectral lines assigned. The large couplings featured by H5O2+ do not hinder, however, to describe the coupled vibrational motion by well defined simple types of vibration (stretching, bending, etc.) based on well defined modes of vibration, in terms of which the spectral lines are assigned. Comparison of our results to recent experiments and calculations on the system is given. The reported MCTDH IR-spectrum is in very good agreement to the recently measured spectrum by Hammer et al. [JCP, 122, 244301, (2005)].

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