A calculating proof on hydrogen bonding in ordinary ice by the first-principles density functional theory

A calculating proof on hydrogen bonding in ordinary ice by the first-principles density functional theory
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第一性原理密度泛函理论对普通冰中氢键的计算证明

DOI:
10.1039/c3ra40317c
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发表时间:
2013-04
期刊:
影响因子:
3.9
通讯作者:
刘扬
刘扬
中科院分区:
化学3区
文献类型:
--
作者:
张鹏;韩圣号;于惠;刘扬

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我们通过计算构造了冰晶格中H2O两两组态的特殊几何结构,并进行了从头算计算,证明了Li和Ross提出的解释两个氢键(HBs)的模型是不正确的[J.C.Li和K.D.Ross,Natural,1993,365,327-329]。根据具有不同键长的声子态密度(PDOS),我们观察到分子内O-H伸缩振动模产生的能级分裂与HBs的双峰强烈相关。我们的模拟结果表明,分子间的Hb分裂可能归因于与内部共价振动的耦合。
We computationally constructed a special geometrical structure of pairwise H2O configuration in the ice crystal lattice and performed ab initio calculations to demonstrate that the model introduced by Li and Ross to explain the two hydrogen bonds (HBs) [J. C. Li and K. D. Ross, Nature, 1993, 365, 327–329] is incorrect. According to the phonon density of states (PDOS) with deferent bond lengths, we observed that the intramolecular O–H stretching vibration modes produce energy level splitting that strongly correlates with the double peaks of HBs. Our simulations provide evidence that intermolecular HB splitting may be attributed to the coupling with the internal covalent vibrations.
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