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Born Oppenheimer Molecular Dynamics calculation of the v_(O-H) IR spectra for acetic acid cyclic dimers

机译:出生的抗替尼默克分子动力学计算乙酸环状二聚体的V_(O-H)IR光谱

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Both ab initio molecular dynamics simulations based on the Born-Oppenheimer approach calculations and a quantum theoretical model are used in order to study the IR spectrum of the acetic acid dimer in the gas phase. The theoretical model is taking into account the strong anharmonic coupling, Davydov coupling, multiple Fermi resonances between the first harmonics of some bending modes and the first excited state of the symmetric combination of the two v_(O-H) modes and the quantum direct and indirect relaxation. The IR spectra obtained from DFT-based molecular dynamics is compared with our theoretical lineshape and with experiment. Note that in a previous work we have shown that our approach reproduces satisfactorily the main futures of the IR experimental lineshapes of the acetic acid dimer [Mohamed el Amine Benmalti, Paul Blaise, H. T. Flakus, Olivier Henri-Rousseau, Chem Phys, 320(2006) 267-274.].
机译:使用基于出生的oppenHeimer方法计算和量子理论模型的AB Initio分子动力学模拟,以研究气相中乙酸二聚体的IR光谱。理论模型考虑了强大的anharmonic耦合,达维Dov耦合,多个Fermi在一些弯曲模式的第一谐波之间的谐振和两个V_(OH)模式的对称组合和量子直接和间接松弛的第一激励状态。将从基于DFT的分子动力学获得的IR光谱与我们的理论厚度和实验进行比较。请注意,在上一项工作中,我们表明我们的方法令人满意地再现醋酸二聚体的IR实验排水平的主要期货[Mohamed El Amine Benmalti,Paul Blaise,HT Flakus,Olivier Henri-Rousseau,Chem Phys,320(2006年)267-274。]。

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