通过量子有效波器来加速评估热密度矩阵的降低参数变化策略通过量子有效波器来接近
Mokshi Sharma1, Tapta Kanchan Roy1,2
1Department of Chemistry and Chemical Sciences, Central University of Jammu. Rahya-Suchani (Bagla), Jammu 181143, India. tkroy@chemistry.du.ac.in.
Physical chemistry chemical physics : PCCP
|October 17, 2025
概括
一种新方法可以准确计算热性质的量子效应. 这种基于布洛赫方程的热有效波器 (TB-EHO) 方法对于分子系统是高效和可靠的.
科学领域:
- 计算化学的计算化学
- 量子力学就是量子力学.
- 理论物理 理论物理
背景情况:
- 准确的热性质量子力学计算对于预测热力学和光谱数据至关重要.
- 无和温度依赖的量子效应显著影响热密度矩阵和振动分区函数的准确性.
研究的目的:
- 开发一种计算效率高,准确的方法来计算热密度矩阵和振动分区函数.
- 使用独立粒子有效波器 (EHO) 的近似方法捕捉量子无和力效应.
主要方法:
- 一个基于布洛赫方程的麦克拉克兰型变量原理被开发出来.
- 该方法使用有效的波器 (EHO) 与多维高斯积函数的近似.
- 优化包括尽量减少精确和模型密度矩阵导数之间的偏差.
主要成果:
- 基于布洛赫方程的热EHO (TB-EHO) 方法准确地复制了在广泛的温度范围内 (0-1000 K) 的参考热特性.
- 对cis-trans异构化反应平衡常数的计算与基准方法和实验数据有很好的一致性.
- 与TB-VSCF相比,TB-EHO方法显示出显著的计算效率,将CPU时间减少约98%
结论:
- TB-EHO方法为计算分子系统的热性质提供了一个高度准确和计算效率高的替代方案.
- 它的速度和准确性使其适用于大型分子系统的应用,而传统方法是不可行的.
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