High-Resolution THz Spectroscopy and Solid-State Density Functional Theory Calculations of Polycyclic Aromatic Hydrocarbons

High-Resolution THz Spectroscopy and Solid-State Density Functional Theory Calculations of Polycyclic Aromatic Hydrocarbons
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多环芳烃的高分辨率太赫兹光谱和固态密度泛函理论计算

DOI:
10.1007/s10762-019-00621-0
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发表时间:
2019
期刊:
Journal of Infrared, Millimeter, and Terahertz Waves
影响因子:
--
通讯作者:
Sasaki Tetsuo
Sasaki Tetsuo
中科院分区:
--
文献类型:
--
作者:
Zhang Feng;Wang Houng-Wei;Tominaga Keisuke;Hayashi Michitoshi;Sasaki Tetsuo

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本文报道了9种多环芳烃(PAHs)晶体的高分辨宽带THz光谱。其中5种多环芳烃由邻位稠合苯环组成,另外4种多环芳烃由周位稠合苯环组成。以蒽和芘晶体为例进行了THz模式的归属。PBE功能增强格里姆的两个色散校正项,D* 和D3,分别进行了严格的评估对频率和同位素位移(IS)的实验标准。D* 和D3项分别采用经验和半经典方法修正伦敦型色散相互作用。通过分子间和分子内振动对振动能的贡献百分比,定量比较了PBE-D* 和PBE-D3模拟的每个THz模式的性质。我们发现,这两种方法在再现蒽和芘晶体的太赫兹模式的频率,IS,和性质的性能相当。
High-resolution and broadband THz spectra of the crystals of nine polycyclic aromatic hydrocarbons (PAHs) are presented. Five PAHs are comprised of ortho-fused benzene rings and the other four of peri-fused benzene rings. THz mode assignment is performed by using the anthracene and pyrene crystals as examples. The performance of the PBE functional augmented by Grimme’s two dispersion correction terms, D*and D3, respectively, are rigorously evaluated against the experimental criteria of frequency and isotope shift (IS). The D*and D3 terms use empirical and semi-classical approach for correcting the London-type dispersion interactions, respectively. The nature of each THz mode simulated by PBE-D*and that by PBE-D3 is quantitatively compared in terms of the percentage contributions of the intermolecular and the intramolecular vibrations to the vibrational energy. We find that the two methods have equivalent performance in reproducing the frequencies, ISs, and nature of THz modes of both the anthracene and pyrene crystals.
使用太赫兹光谱和 DFT 计算对低频振动中硫醇基团和羟基的活性进行比较评估。
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