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arXiv 2602.09790physics.chem-ph
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多级DFT响应理论

Multilevel DFT Response Theory

Norwegian University of Science and Technology(挪威科技大学);University of Rome Tor Vergata(罗马托尔维加塔大学)

Alberto Barlini, Julien Bloino, Henrik Koch, Tommaso Giovannini

AI总结:

本研究提出了一种基于多级DFT的响应理论方法,用于高效计算复杂环境中分子响应性质,通过极化量子嵌入框架结合波动电荷力场,实现了对溶质-溶剂相互作用的深入分析。

摘要:

我们提出了一种通用的计算协议,用于在极化量子嵌入框架内评估复杂环境中广泛的分子响应性质。该方法通过为MLDFT哈密顿量制定耦合扰动Kohn-Sham(CPKS)方程,将多级密度泛函理论(MLDFT)扩展到响应理论。该方法进一步耦合到基于波动电荷(FQ)力场的额外极化分子力学层,这使得能够以准确且计算高效的方式描述长程相互作用。我们应用这种新协议计算对硝基苯胺(PNA)在1,4-二氧烷和3-羟基苯甲酸(HBA)在水溶液中的静态和频率依赖的线性极化率及一阶极化率。该框架通过分离静电、相互极化和量子限制(Pauli排斥)之间的竞争作用,提供了对溶质-溶剂相互作用的物理化学见解。结果与现有实验一致,证明了所提出方法的可靠性和鲁棒性,并为量子嵌入方法中的响应性质提供了一条可行的途径。

英文摘要:

We present a general computational protocol for the evaluation of extensive molecular response properties in complex environments within a polarizable quantum embedding framework. The approach extends multilevel density functional theory (MLDFT) to response theory by formulating the coupled-perturbed Kohn-Sham (CPKS) equations for the MLDFT Hamiltonian. The method is further coupled to an additional polarizable molecular mechanics layer based on the fluctuating-charge (FQ) force field, which allows an accurate yet computationally efficient description of long-range interactions. We apply this new protocol to compute static and frequency-dependent linear polarizabilities and first hyperpolarizabilities of para-nitroaniline (PNA) in 1,4-dioxane and 3-hydroxybenzoic acid (HBA) in aqueous solution. The framework enables physicochemical insight into solute-solvent interactions by disentangling the competing roles of electrostatics, mutual polarization, and quantum confinement (Pauli repulsion). The results match available experiments, demonstrating the reliability and robustness of the proposed approach and providing a viable route for response properties within quantum embedding methods.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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