一个可扩展的路线到第一阶响应属性与相关采样无相辅助场量子蒙特卡洛
Leon Otis1, Saisrinivas Gudivada1, Marvin Friede2
1Department of Chemistry, Rice University, Houston, Texas 77005-1892, United States.
The journal of physical chemistry letters
|October 24, 2025
概括
本研究引入了一种新的算法,用于计算使用无相辅助场量子蒙特卡洛 (ph-AFQMC) 的电偶极时刻. 该方法准确预测分子性质,为复杂的电子结构计算提供了可扩展的方法.
科学领域:
- 计算化学的计算化学
- 量子力学就是量子力学.
- 电子结构理论 电子结构理论
背景情况:
- 准确预测化学性质对于将理论模型与实验数据相连接至关重要.
- 相关电子结构理论对于可靠的能量和属性预测至关重要.
研究的目的:
- 开发和验证使用无相辅助场量子蒙特卡洛 (ph-AFQMC) 计算一阶响应属性的有限差异算法.
- 评估ph-AFQMC用于预测分子中的电偶极时刻的准确性.
主要方法:
- 在ph-AFQMC框架内实现对响应属性的有限差异算法.
- 使用分支相关采样方法进行高效的计算.
- 与合集群单个和双重与扰动三重 (CCSD ((T)) 和实验数据进行比较.
主要成果:
- 具有平均场试验波函数的Ph-AFQMC准确地预测了不同类型分子的电偶极时刻.
- 双极时刻预测的准确性随着相关的试验波函数而系统地提高,特别是在强相关的系统中.
- 开发的ph-AFQMC方法克服了扰动理论在描述HF解离等具有挑战性的案例时的局限性.
结论:
- 提出的ph-AFQMC算法提供了一个可扩展和准确的方法来计算电偶极时刻.
- 该方法在各种分子大小和相关系制度中表现出稳健性.
- 这项工作增强了量子蒙特卡洛方法用于预测实验测量相关的分子性能的能力.
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