在没有校准函数的局部混合函数中抑制标尺问题:选择局部混合函数的选择
Alexei V Arbuznikov1, Artur Wodyński1, Martin Kaupp1
1Institut für Chemie, Technische Universität Berlin, Theoretische Chemie, Sekr. C7, Straße des 17. Juni 135, D-10623 Berlin, Germany.
The Journal of chemical physics
|October 23, 2024
概括
新的局部混合功能 (LHs) 通过定制精确交换添加剂来减少没有校准功能的错误. 功能LH24x实现了与LH20t相似的精度,简化了理论方法.
科学领域:
- 计算化学是一种计算化学.
- 量子化学是一种量子化学.
- 材料科学是一种材料科学.
背景情况:
- 局部混合函数 (LHs) 通过平衡自我相互作用和静态关联错误,比传统函数提供优势.
- 对于LHs来说,一个关键的挑战是尺度问题,这是由于交换能量密度的模糊性造成的.
研究的目的:
- 在不使用校准函数 (CF) 的情况下,研究一种减少LHs中标尺问题文物的方法.
- 通过定制本地混合函数 (LMF) 来开发和评估一个新的功能,最大限度地减少非物理贡献.
主要方法:
- 基于精确交换 (EXX) 和半局部交换能量密度的比率的交换LMF (x-LMF) 的发展.
- EXX添加剂的空间定制以抑制虚假的正能量密度贡献.
- 综合和空间分辨的能量密度与现有函数的比较分析.
主要成果:
- 拟议的x-LMF方法显著减少了来自测距问题的非物理贡献,而不需要CFs.
- 由此产生的 LH24x 函数的准确性与 GMTKN55 测试套件上的 LH20t 等既有函数的准确性相当.
- 详细的能量密度分析证实了量身定制的LMF在减轻尺寸文物方面的有效性.
结论:
- 定制局部混合函数 (LMF) 是解决局部混合函数中标尺问题的一个有效策略.
- 功能LH24x提供了一个有前途的替代方案,在不需要校准功能的情况下实现高精度.
- 非物理物体的固有取消有助于LHs对化学能量差异的强大性能.
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