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Exploratory data science on supercomputers for quantum mechanical calculations 超级计算机上用于量子力学计算的探索性数据科学
IF 2.6 Q3 CHEMISTRY, PHYSICAL Pub Date : 2024-06-11 DOI: 10.1088/2516-1075/ad4b80
William Dawson, Louis Beal, Laura E Ratcliff, Martina Stella, Takahito Nakajima, Luigi Genovese
Literate programming—the bringing together of program code and natural language narratives—has become a ubiquitous approach in the realm of data science. This methodology is appealing as well for the domain of Density Functional Theory (DFT) calculations, particularly for interactively developing new methodologies and workflows. However, effective use of literate programming is hampered by old programming paradigms and the difficulties associated with using high performance computing (HPC) resources. Here we present two Python libraries that aim to remove these hurdles. First, we describe the PyBigDFT library, which can be used to setup materials or molecular systems and provides high-level access to the wavelet based BigDFT code. We then present the related remotemanager library, which is able to serialize and execute arbitrary Python functions on remote supercomputers. We show how together these libraries enable transparent access to HPC based DFT calculations and can serve as building blocks for rapid prototyping and data exploration.
有文字的编程--将程序代码和自然语言叙述结合在一起--已成为数据科学领域无处不在的方法。这种方法对于密度泛函理论(DFT)计算领域也很有吸引力,尤其是在交互式开发新方法和工作流程方面。然而,旧的编程范式和使用高性能计算(HPC)资源的困难阻碍了有文化编程的有效使用。在此,我们介绍两个旨在消除这些障碍的 Python 库。首先,我们介绍 PyBigDFT 库,该库可用于设置材料或分子系统,并提供对基于小波的 BigDFT 代码的高级访问。然后,我们介绍了相关的 remotemanager 库,它能够在远程超级计算机上序列化和执行任意 Python 函数。我们展示了这些库如何共同实现对基于 HPC 的 DFT 计算的透明访问,以及如何作为快速原型开发和数据探索的构建模块。
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引用次数: 0
From electronic structure to magnetism and skyrmions 从电子结构到磁性和天膜
IF 2.6 Q3 CHEMISTRY, PHYSICAL Pub Date : 2024-06-06 DOI: 10.1088/2516-1075/ad43d0
Vladislav Borisov
Solid state theory, density functional theory and its generalizations for correlated systems together with numerical simulations on supercomputers allow nowadays to model magnetic systems realistically and in detail and can be even used to predict new materials, paving the way for more rapid material development for applications in energy storage and conversion, information technologies, sensors, actuators etc. Modeling magnets on different length scales (between a few Ångström and several micrometers) requires, however, approaches with very different mathematical formulations. Parameters defining the material in each formulation can be determined either by fitting experimental data or from theoretical calculations and there exists a well-established approach for obtaining model parameters for each length scale using the information from the smaller length scale. In this review, this approach will be explained step-by-step in textbook style with examples of successful scale-bridging modeling of different classes of magnetic materials from the research literature as well as based on results newly obtained for this review.
固态理论、密度泛函理论及其相关系统的广义理论,再加上超级计算机上的数值模拟,如今可以对磁性系统进行真实而详细的建模,甚至可以用来预测新材料,为更快速地开发应用于能源存储和转换、信息技术、传感器、致动器等领域的材料铺平道路。然而,不同长度尺度(从几埃到几微米)的磁体建模需要采用截然不同的数学公式。每种公式中定义材料的参数都可以通过拟合实验数据或理论计算来确定,并且有一种成熟的方法可以利用较小长度尺度的信息来获得每个长度尺度的模型参数。在本综述中,将以教科书的形式逐步解释这种方法,并举例说明研究文献中不同类别磁性材料尺度桥接建模的成功案例,以及基于本综述最新获得的结果。
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引用次数: 0
Molecular NMR shieldings, J-couplings, and magnetizabilities from numeric atom-centered orbital based density-functional calculations 基于原子中心轨道的密度函数数值计算得出的分子核磁共振屏蔽、J-耦合和磁化率
IF 2.6 Q3 CHEMISTRY, PHYSICAL Pub Date : 2024-05-29 DOI: 10.1088/2516-1075/ad45d4
Raul Laasner, Iuliia Mandzhieva, William P Huhn, Johannes Colell, Victor Wen-zhe Yu, Warren S Warren, Thomas Theis and Volker Blum
This paper reports and benchmarks a new implementation of nuclear magnetic resonance shieldings, magnetizabilities, and J-couplings for molecules within semilocal density functional theory, based on numeric atom-centered orbital (NAO) basis sets. NAO basis sets are attractive for the calculation of these nuclear magnetic resonance (NMR) parameters because NAOs provide accurate atomic orbital representations especially near the nucleus, enabling high-quality results at modest computational cost. Moreover, NAOs are readily adaptable for linear scaling methods, enabling efficient calculations of large systems. The paper has five main parts: (1) It reviews the formalism of density functional calculations of NMR parameters in one comprehensive text to make the mathematical background available in a self-contained way. (2) The paper quantifies the attainable precision of NAO basis sets for shieldings in comparison to specialized Gaussian basis sets, showing similar performance for similar basis set size. (3) The paper quantifies the precision of calculated magnetizabilities, where the NAO basis sets appear to outperform several established Gaussian basis sets of similar size. (4) The paper quantifies the precision of computed J-couplings, for which a group of customized NAO basis sets achieves precision of ∼Hz for smaller basis set sizes than some established Gaussian basis sets. (5) The paper demonstrates that the implementation is applicable to systems beyond 1000 atoms in size.
本文以数值原子中心轨道(NAO)基集为基础,报告了半局部密度泛函理论中分子核磁共振屏蔽、磁化率和J耦合的新实现方法,并对其进行了基准测试。NAO基础集对计算这些核磁共振(NMR)参数很有吸引力,因为NAO提供了精确的原子轨道表示,尤其是在原子核附近,从而能以适度的计算成本获得高质量的结果。此外,NAO 还可用于线性缩放方法,从而实现大型系统的高效计算。本文包括五个主要部分:(1) 本文综述了核磁共振参数密度泛函计算的形式主义,以自成一体的方式介绍了数学背景。(2) 本文量化了用于屏蔽的 NAO 基集与专门的高斯基集相比可达到的精度,表明在基集大小相近的情况下,两者的性能相似。(3) 论文对计算磁化率的精度进行了量化,其中 NAO 基集似乎优于几个大小相似的既定高斯基集。(4) 论文对J耦合的计算精度进行了量化,其中一组定制的NAO基集在基集尺寸小于一些既定高斯基集的情况下,精度达到了∼Hz。(5) 论文证明,该实施方法适用于超过 1000 个原子大小的系统。
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引用次数: 0
Impact of nuclear effects on the ultrafast dynamics of an organic/inorganic mixed-dimensional interface 核效应对有机/无机混维界面超快动力学的影响
IF 2.6 Q3 CHEMISTRY, PHYSICAL Pub Date : 2024-05-29 DOI: 10.1088/2516-1075/ad4d46
Matheus Jacobs, Karen Fidanyan, Mariana Rossi and Caterina Cocchi
Electron dynamics at weakly bound interfaces of organic/inorganic materials are easily influenced by large-amplitude nuclear motion. In this work, we investigate the effects of different approximations to the equilibrium nuclear distributions on the ultrafast charge-carrier dynamics of a laser-excited hybrid organic/inorganic interface. By considering a prototypical system consisting of pyrene physisorbed on a MoSe2 monolayer, we analyze linear absorption spectra, electronic density currents, and charge-transfer dynamics induced by a femtosecond pulse in resonance with the frontier-orbital transition in the molecule. The calculations are based on ab initio molecular dynamics with classical and quantum thermostats, followed by time-dependent density-functional theory coupled to multi-trajectory Ehrenfest dynamics. We impinge the system with a femtosecond (fs) pulse of a few hundred GW cm−2 intensity and propagate it for 100 fs. We find that the optical spectrum is insensitive to different nuclear distributions in the energy range dominated by the excitations localized on the monolayer. The pyrene resonance, in contrast, shows a small blue shift at finite temperatures, hinting at an electron-phonon-induced vibrational-level renormalization. The electronic current density following the excitation is affected by classical and quantum nuclear sampling through suppression of beating patterns and faster decay times. Interestingly, finite temperature leads to a longer stability of the ultrafast charge transfer after excitation. Overall, the results show that the ultrafast charge-carrier dynamics are dominated by electronic rather than by nuclear effects at the field strengths and time scales considered in this work.
有机/无机材料弱结合界面上的电子动力学很容易受到大振幅核运动的影响。在这项工作中,我们研究了平衡核分布的不同近似值对激光激发的有机/无机混合界面的超快电荷载流子动力学的影响。通过考虑由物理吸附在 MoSe2 单层上的芘组成的原型系统,我们分析了线性吸收光谱、电子密度电流以及飞秒脉冲与分子中前沿轨道转变共振诱导的电荷转移动力学。计算基于带有经典和量子恒温器的 ab initio 分子动力学,然后是与多轨迹 Ehrenfest 动力学相耦合的时变密度泛函理论。我们用强度为几百 GW cm-2 的飞秒 (fs) 脉冲冲击该系统并传播 100 fs。我们发现,在单层局部激发的能量范围内,光谱对不同的核分布并不敏感。相反,芘共振在有限温度下显示出微小的蓝移,暗示了电子-声子诱导的振动级重正化。激发后的电子电流密度受到经典和量子核取样的影响,跳动模式受到抑制,衰变时间加快。有趣的是,有限温度导致激发后的超快电荷转移具有更长的稳定性。总之,研究结果表明,在本研究考虑的场强和时间尺度下,超快电荷载流子动力学是由电子效应而非核效应主导的。
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引用次数: 0
In-plane magnetization orientation driven topological phase transition in OsCl3 monolayer 面内磁化取向驱动的 OsCl3 单层拓扑相变
IF 2.6 Q3 CHEMISTRY, PHYSICAL Pub Date : 2024-05-27 DOI: 10.1088/2516-1075/ad4b81
Ritwik Das, Subhadeep Bandyopadhyay and Indra Dasgupta
The quantum anomalous Hall effect resulting from the in-plane magnetization in the OsCl3 monolayer is shown to exhibit different electronic topological phases determined by the crystal symmetries and magnetism. In this Chern insulator, the Os-atoms form a two dimensional planar honeycomb structure with an easy-plane ferromagnetic configuration and the required non-adiabatic paths to tune the topology of electronic structure exist for specific magnetic orientations based on mirror symmetries of the system. Using density functional theory (DFT) calculations, these tunable phases are identified by changing the orientation of the magnetic moments. We argue that in contrast to the buckled system, here the Cl-ligands bring non-trivial topology into the system by breaking the in-plane mirror symmetry. The interplay between the magnetic anisotropy and electronic band-topology changes the Chern number and hence the topological phases. Our DFT study is corroborated with comprehensive analysis of relevant symmetries as well as a detailed explanation of topological phase transitions using a generic tight binding model.
研究表明,OsCl3 单层中的面内磁化产生的量子反常霍尔效应表现出由晶体对称性和磁性决定的不同电子拓扑相。在这种切尔绝缘体中,Os 原子形成了具有易平面铁磁性构型的二维平面蜂窝结构,并且根据系统的镜像对称性,在特定磁性方向上存在调整电子结构拓扑所需的非绝热路径。利用密度泛函理论(DFT)计算,我们通过改变磁矩的取向确定了这些可调相。我们认为,与降压系统相反,这里的 Cl 配体通过打破面内镜像对称性为系统带来了非三维拓扑结构。磁各向异性和电子带拓扑之间的相互作用改变了切尔数,从而改变了拓扑相。我们的 DFT 研究通过对相关对称性的全面分析以及使用通用紧密结合模型对拓扑相变的详细解释得到了证实。
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引用次数: 0
Computation of the expectation value of the spin operator S^2 for the spin-flip Bethe–Salpeter equation 计算自旋翻转贝特-萨尔佩特方程的自旋算子 S^2 的期望值
IF 2.6 Q3 CHEMISTRY, PHYSICAL Pub Date : 2024-05-20 DOI: 10.1088/2516-1075/ad48ed
B A Barker, A Seshappan and D A Strubbe
Spin-flip (SF) methods applied to excited-state approaches like the Bethe–Salpeter equation allow access to the excitation energies of open-shell systems, such as molecules and defects in solids. The eigenstates of these solutions, however, are generally not eigenstates of the spin operator . Even for simple cases where the excitation vector is expected to be, for example, a triplet state, the value of may be found to differ from 2.00; this difference is called ‘spin contamination’. The expectation values must be computed for each excitation vector, to assist with the characterization of the particular excitation and to determine the amount of spin contamination of the state. Our aim is to provide for the first time in the SF methods literature a comprehensive resource on the derivation of the formulas for as well as its computational implementation. After a brief discussion of the theory of the SF Bethe–Salpeter equation (BSE) and some examples further illustrating the need for calculating , we present the derivation for the general equation for computing with the eigenvectors from an SF-BSE calculation, how it is implemented in a Python script, and timing information on how this calculation scales with the size of the SF-BSE Hamiltonian.
将自旋翻转(SF)方法应用于激发态方法(如贝特-萨尔佩特方程),可以获得开壳系统(如分子和固体中的缺陷)的激发能量。然而,这些解的特征状态通常不是自旋算子的特征状态。即使在激发矢量预期为三重态等简单情况下,也可能发现其值与 2.00 存在差异;这种差异被称为 "自旋污染"。必须计算每个激发矢量的期望值,以帮助确定特定激发的特征,并确定态的自旋污染量。我们的目的是首次在 SF 方法文献中提供有关公式推导及其计算实现的全面资源。在简要讨论了 SF Bethe-Salpeter 方程(BSE)的理论和一些进一步说明计算必要性的例子之后,我们介绍了用 SF-BSE 计算得出的特征向量进行计算的一般公式的推导、如何在 Python 脚本中实现该公式,以及关于该计算如何随 SF-BSE 哈密顿的大小而缩放的定时信息。
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引用次数: 0
Excited-state downfolding using ground-state formalisms 利用基态形式的激发态下折
IF 2.6 Q3 CHEMISTRY, PHYSICAL Pub Date : 2024-05-14 DOI: 10.1088/2516-1075/ad46b6
Nicholas P Bauman
Downfolding coupled cluster (CC) techniques are powerful tools for reducing the dimensionality of many-body quantum problems. This work investigates how ground-state downfolding formalisms can target excited states using non-Aufbau reference determinants, paving the way for applications of quantum computing in excited-state chemistry. This study focuses on doubly excited states for which canonical equation-of-motion CC approaches struggle to describe unless one includes higher-than-double excitations. The downfolding technique results in state-specific effective Hamiltonians that, when diagonalized in their respective active spaces, provide ground- and excited-state total energies (and therefore excitation energies) comparable to high-level CC methods. The performance of this procedure is examined with doubly excited states of H2, Methylene, Formaldehyde, and Nitroxyl.
下折耦合簇(CC)技术是降低多体量子问题维度的有力工具。这项工作研究了基态下折形式如何利用非奥夫波参考行列式来瞄准激发态,从而为量子计算在激发态化学中的应用铺平道路。这项研究的重点是双激发态,对于这些态,除非包含比双激发态更高的激发,否则经典的运动方程 CC 方法难以描述。下折技术产生了特定状态的有效哈密顿,在各自的活性空间中对其进行对角时,可提供与高级 CC 方法相当的基态和激发态总能量(以及激发能量)。我们用 H2、Methylene、Formaldehyde 和 Nitroxyl 的双激发态检验了这一程序的性能。
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引用次数: 0
Density functional theory beyond the Born–Oppenheimer approximation: exact mapping onto an electronically non-interacting Kohn–Sham molecule 超越玻恩-奥本海默近似的密度泛函理论:电子非相互作用科恩-沙姆分子的精确映射
IF 2.6 Q3 CHEMISTRY, PHYSICAL Pub Date : 2024-05-12 DOI: 10.1088/2516-1075/ad45d5
Emmanuel Fromager and Benjamin Lasorne
This work presents an alternative, general, and in-principle exact extension of electronic Kohn–Sham density functional theory (KS-DFT) to the fully quantum-mechanical molecular problem. Unlike in existing multi-component or exact-factorization-based DFTs of electrons and nuclei, both nuclear and electronic densities are mapped onto a fictitious electronically non-interacting molecule (referred to as KS molecule), where the electrons still interact with the nuclei. Moreover, in the present molecular KS-DFT, no assumption is made about the mathematical form (exactly factorized or not) of the molecular wavefunction. By expanding the KS molecular wavefunction à la Born–Huang, we obtain a self-consistent set of ‘KS beyond Born–Oppenheimer’ electronic equations coupled to nuclear equations that describe nuclei interacting among themselves and with non-interacting electrons. An exact adiabatic connection formula is derived for the Hartree-exchange-correlation energy of the electrons within the molecule and, on that basis, a practical adiabatic density-functional approximation is proposed and discussed.
这项研究提出了电子科恩-沙姆密度泛函理论(Kohn-Sham density functional theory,KS-DFT)的替代性、一般性和原理上的精确扩展,以解决完全量子力学的分子问题。与现有的电子和原子核的多分量或基于精确因子的 DFT 不同,核密度和电子密度都映射到一个虚构的电子不相互作用分子(称为 KS 分子)上,其中电子仍然与原子核相互作用。此外,在目前的分子 KS-DFT 中,并没有假设分子波函数的数学形式(精确因式化与否)。通过像玻恩-黄那样扩展 KS 分子波函数,我们得到了一组自洽的 "超越玻恩-奥本海默的 KS "电子方程组,它们与描述原子核之间以及原子核与非相互作用电子之间相互作用的核方程组相耦合。在此基础上,我们提出并讨论了一种实用的绝热密度函数近似。
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引用次数: 0
Ensemble variational Monte Carlo for optimization of correlated excited state wave functions 优化相关激发态波函数的集合变异蒙特卡洛算法
IF 2.6 Q3 CHEMISTRY, PHYSICAL Pub Date : 2024-04-08 DOI: 10.1088/2516-1075/ad38f8
William A Wheeler, Kevin G Kleiner, Lucas K Wagner
Variational Monte Carlo methods have recently been applied to the calculation of excited states; however, it is still an open question what objective function is most effective. A promising approach is to optimize excited states using a penalty to minimize overlap with lower eigenstates, which has the drawback that states must be computed one at a time. We derive a general framework for constructing objective functions with minima at the the lowest N eigenstates of a many-body Hamiltonian. The objective function uses a weighted average of the energies and an overlap penalty, which must satisfy several conditions. We show this objective function has a minimum at the exact eigenstates for a finite penalty, and provide a few strategies to minimize the objective function. The method is demonstrated using ab initio variational Monte Carlo to calculate the degenerate first excited state of a CO molecule.
变异蒙特卡洛方法最近被应用于激发态的计算;然而,什么目标函数最有效仍是一个悬而未决的问题。一种很有前途的方法是利用惩罚来优化激发态,以尽量减少与低特征态的重叠,但这种方法的缺点是必须一次计算一个态。我们推导出一个通用框架,用于构建在多体哈密顿最低 N 个特征状态处具有最小值的目标函数。目标函数使用能量的加权平均值和重叠惩罚,必须满足几个条件。我们证明了在罚金有限的情况下,该目标函数在精确特征点处具有最小值,并提供了几种最小化目标函数的策略。我们利用 ab initio 变分蒙特卡洛计算一氧化碳分子的退化第一激发态来演示该方法。
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引用次数: 0
Importance profiles. Visualization of atomic basis set requirements 重要性剖面图原子基集要求的可视化
IF 2.6 Q3 CHEMISTRY, PHYSICAL Pub Date : 2024-04-02 DOI: 10.1088/2516-1075/ad31ca
Susi Lehtola
Recent developments in fully numerical methods promise interesting opportunities for new, compact atomic orbital (AO) basis sets that maximize the overlap to fully numerical reference wave functions, following the pioneering work of Richardson and coworkers from the early 1960s. Motivated by this technique, we suggest a way to visualize the importance of AO basis functions employing fully numerical wave functions computed at the complete basis set limit: the importance of a normalized AO basis function <inline-formula><tex-math><?CDATA $|alpharangle$?></tex-math><mml:math overflow="scroll"><mml:mrow><mml:mo stretchy="false">|</mml:mo><mml:mi>α</mml:mi><mml:mo fence="false" stretchy="false">⟩</mml:mo></mml:mrow></mml:math><inline-graphic xlink:href="estad31caieqn1.gif" xlink:type="simple"></inline-graphic></inline-formula> centered on some nucleus can be visualized by projecting <inline-formula><tex-math><?CDATA $|alpharangle$?></tex-math><mml:math overflow="scroll"><mml:mrow><mml:mo stretchy="false">|</mml:mo><mml:mi>α</mml:mi><mml:mo fence="false" stretchy="false">⟩</mml:mo></mml:mrow></mml:math><inline-graphic xlink:href="estad31caieqn2.gif" xlink:type="simple"></inline-graphic></inline-formula> on the set of numerically represented occupied orbitals <inline-formula><tex-math><?CDATA $|psi_{i}rangle$?></tex-math><mml:math overflow="scroll"><mml:mrow><mml:mo stretchy="false">|</mml:mo><mml:msub><mml:mi>ψ</mml:mi><mml:mrow><mml:mi>i</mml:mi></mml:mrow></mml:msub><mml:mo fence="false" stretchy="false">⟩</mml:mo></mml:mrow></mml:math><inline-graphic xlink:href="estad31caieqn3.gif" xlink:type="simple"></inline-graphic></inline-formula> as <inline-formula><tex-math><?CDATA $I_{0}(alpha) = sum_{i}langlealpha|psi_{i}ranglelanglepsi_{i}|alpharangle$?></tex-math><mml:math overflow="scroll"><mml:mrow><mml:msub><mml:mi>I</mml:mi><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mi>α</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:mo>=</mml:mo><mml:munder><mml:mo>∑</mml:mo><mml:mrow><mml:mi>i</mml:mi></mml:mrow></mml:munder><mml:mo fence="false" stretchy="false">⟨</mml:mo><mml:mi>α</mml:mi><mml:mrow><mml:mo stretchy="false">|</mml:mo></mml:mrow><mml:msub><mml:mi>ψ</mml:mi><mml:mrow><mml:mi>i</mml:mi></mml:mrow></mml:msub><mml:mo fence="false" stretchy="false">⟩</mml:mo><mml:mo fence="false" stretchy="false">⟨</mml:mo><mml:msub><mml:mi>ψ</mml:mi><mml:mrow><mml:mi>i</mml:mi></mml:mrow></mml:msub><mml:mrow><mml:mo stretchy="false">|</mml:mo></mml:mrow><mml:mi>α</mml:mi><mml:mo fence="false" stretchy="false">⟩</mml:mo></mml:mrow></mml:math><inline-graphic xlink:href="estad31caieqn4.gif" xlink:type="simple"></inline-graphic></inline-formula>. Choosing <italic toggle="yes">α</italic> to be a continuous parameter describing the AO basis, such as the exponent of a Gaussian-type orbital or Slater-type orbital basis function, one is then able to visualize the importance of various functions. The proposed visuali
继理查德森及其同事在 20 世纪 60 年代初的开创性工作之后,全数值方法的最新发展为新的、紧凑的原子轨道(AO)基集提供了有趣的机会,这种基集能够最大限度地与全数值参考波函数重叠。受这一技术的启发,我们提出了一种方法,利用在完整基集极限计算的全数值波函数,直观地显示 AO 基集的重要性:以某个原子核为中心的归一化 AO 基函数 |α⟩ 的重要性,可以通过将 |α⟩ 投射到数值表示的占位轨道集 |ψi⟩ 上而直观地显示出来,即 I0(α)=∑i⟨α|ψi⟩⟨ψi|α⟩。选择α作为描述AO基础的连续参数,如高斯型轨道或斯莱特型轨道基础函数的指数,就可以直观地看到各种函数的重要性。建议的可视化 I0(α) 具有重要的特性 0⩽I0(α)⩽1,可以做出明确的解释。我们还提出了多原子应用重要性曲线 I(α) 的直接概括,其中测试函数 |α⟩ 的重要性是根据从原子最小基础投影的增加来衡量的。我们以计算前三行原子和一组化学性质不同的二原子分子的重要性剖面为例,对这些方法进行了示范。我们发现,只要有完全数值化的参考波函数,重要度剖面图就能以先验的方式直观显示特定系统对原子基集的要求。
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引用次数: 0
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Electronic Structure
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