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用一个廉价的核心无电子的三体相关系因子进行生物正常轨道优化,用于量子蒙特卡洛和超相关性

Abdallah Ammar¹, Anthony Scemama¹, Emmanuel Giner²

¹Laboratoire de Chimie et Physique Quantiques (UMR 5626), Université de Toulouse, CNRS, UPS, 31062 Toulouse, France.

Journal of chemical theory and computation

|June 30, 2023

概括

本研究提出了用于电子结构计算的新型三体相关系数. 这一因素提高了原子和分子的变量蒙特卡洛方法的精度和计算效率.

科学领域:

计算化学计算化学
量子化学是一个量子化学.
电子结构理论电子结构理论

背景情况:

准确描述电子相关性对于预测分子性质至关重要.
传统的方法经常与电子相关的计算成本作斗争,特别是对于更重的元素.
变量蒙特卡洛 (VMC) 方法提供了一个有希望的途径,但需要有效的相关系数.

研究的目的:

为电子结构计算引入一种新的,计算效率高的三体相关系数.
为了优化这个因子和分子轨道在一个跨相关的哈密尔顿框架内.
评估相关系因子参数从原子到分子系统的可转移性.

主要方法:

开发和实施一种新的三体相关系因子.
优化单个斯莱特决定子内的轨道,使用生物规范框架和跨相关的哈密尔顿式.
斯莱特-贾斯托波函数应用于原子和分子系统,包括二列和三维过渡金属.
使用混合分析和数字集成方案来提高计算效率.

主要成果:

在所有测试的原子和分子系统中,系统地降低变量的蒙特卡洛能量.
证明了最佳相关系因子参数从原子到分子计算的可转移性.
通过减少昂贵的数值集成步骤,实现了显著的计算加速度.

结论:

新的三体相关系数为电子结构计算提供了更准确,更有效的方法.
该方法在涉及二列和三维过渡金属的系统中表现出色.
参数的可转移性表明,对于未来的研究来说,这是一个强大的,广泛适用的相关系数.

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