对于多配置Ehrenfest动态的最佳初始条件采样
Thies Romig1, Francesco Montorsi2, Francesco Segatta2
1Institut für Physik, Universität Rostock, Albert-Einstein-Str. 23-24, 18059 Rostock, Germany.
多配置Ehrenfest (MCE) 方法使用轨迹模拟量子动力学. 对于初始条件的立方网策略对于非adiabatic过渡是普遍有效的.
科学领域:
- 计算化学计算化学
- 量子动力学 量子动力学是什么?
- 在一秒钟的科学.
背景情况:
- 精确的量子动力学模拟对于复杂的系统来说是计算上昂贵的.
- 在许多化学和物理过程中,非adiabatic转换是至关重要的.
- 多配置埃伦费斯特 (MCE) 方法提供了一种混合量子半经典方法.
研究的目的:
- 评估在MCE中生成初始轨迹条件的策略.
- 为了确定准确的非adiabatic动态模拟的最佳初始条件.
- 评估MCE对具有多个形交叉点和宽带激发的系统的适用性.
主要方法:
- 系统评估物理 (维格纳,压缩维格纳) 和几何 (球形,立方网格) 初始条件生成策略.
- 对轨迹克隆进行分析,以提高多个形交叉点的系统的性能.
- 评估MCE适用于模拟具有许多合电子状态的系统的适用性.
主要成果:
- 无维坐标单位间隔的立方格被确定为一个近乎通用的和独立于系统的初始条件策略.
- 轨迹克隆可以在多个形交叉点的系统中提高MCE的性能,这取决于基础的融合.
- MCE在模拟宽带激发过程中表现出了特别的优势.
结论:
- 立方网策略显著提高了MCE模拟的效率和准确性.
- MCE是一种灵活且有利的方法来模拟非adiabatic动态,特别是在具有多个合电子状态的系统中.
- 由于MCE具有平行实施的灵活性,因此它对于先进的秒速科学应用非常重要.
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