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    苏艳

    • 教授     博士生导师   硕士生导师
    • 性别:女
    • 毕业院校:大连化物所
    • 学位:博士
    • 所在单位:物理学院
    • 学科:凝聚态物理
    • 办公地点:科技园大厦C座309
    • 电子邮箱:su.yan@dlut.edu.cn

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    Which Density Functional Should Be Used to Describe Protonated Water Clusters?

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    论文类型:期刊论文

    发表时间:2017-04-27

    发表刊物:JOURNAL OF PHYSICAL CHEMISTRY A

    收录刊物:SCIE、EI、PubMed

    卷号:121

    期号:16

    页面范围:3117-3127

    ISSN号:1089-5639

    摘要:Protonated water cluster is one of the most important hydrogen-bond network systems. Finding an appropriate DFT method to study the properties of protonated water clusters can substantially improve the economy in computational resources without sacrificing the accuracy compared to high-level methods. Using high-level MP2 and CCSD(T) methods as well as, experimental results as benchmark, we systematically examined the effect of seven exchange-correlation GGA functionals (with BLYP, B3LYP, X3LYP, PBE0, PBE1W, M05-2X, and B97-D parametrizations) in describing the geometric parameters, interaction energies, dipole moments, and vibrational properties of protonated water clusters H+(H2O)(2-9,12). The overall performance of all these functionals is acceptable, and each of them has its advantage in certain aspects. X3LYP is the best to describe the interaction energies, and PBE0 and: M05-2X are also recommended to investigate interaction energies. PBE0 gives the best anharmonic frequencies, followed by PBE1W, B97-D and BLYP methods. PBE1W, B3LYP, B97-D, and X3LYP can yield better geometries. The capability of B97-D to distinguish the relative energies between isomers is the best among all the seven methods, followed by M05-2X and PBE0.