使用FLOSIC来了解离子-溶剂相互作用
Mark R Pederson1, Kushantha P K Withanage1, Zahra Hooshmand1
1Physics Department, University of Texas at El Paso, El Paso, Texas 79968, USA.
The Journal of chemical physics
|October 20, 2023
概括
群众来源的费米-洛文丁-轨道-自我相互作用校正 (FLOSIC) 计算准确地描述了水中的[Cr(C2O4) 3) 3-三离子的电子结构. 这种方法纠正了传统密度函数近似中发现的错误,提高了地球化学建模的准确性.
科学领域:
- 计算化学计算化学
- 量子化学 是一个量子化学.
- 地质化学 地质化学
背景情况:
- 较低密度的功能近似通常无法准确地描述离子电子结构,表现出正的最高占成的分子轨道能量水平.
- 三离子[Cr(C2O4)3]3-对于将岩石中的同位素比例与地质时间内的大气氧气水平联系起来至关重要.
研究的目的:
- 将众筹的费米-洛文丁-轨道-自我相互作用校正 (FLOSIC) 计算应用于溶液中的复杂三元体.
- 为了解决离子系统的标准密度函数近似中普遍存在的自我相互作用错误.
- 为了实现精确的地化学建模,涉及同位素和大气氧气.
主要方法:
- 利用众包来进行对水中的[Cr(C2O4) 3) - - 三离子的自相一致的FLOSIC计算.
- 与最初的实施相比,使用组理论和稀疏性使计算速度提高了125倍.
- 分析了Cr和O原子的核心级移动,以及集成的电荷密度和库伦电位.
主要成果:
- 通过FLOSIC计算,为trianion和周围的水分子提供了物理正确的电子结构.
- 未经纠正的局部密度近似 (LDA) 计算显示,从离子到水浴的电荷转移显著而不正确.
- FLOSIC计算扭转了LDA观察到的错误的电荷转移,并且显示了与实验核心电离能比其他测试的函数更好的一致性.
结论:
- FLOSIC计算为离子系统的密度函数近似中的自我相互作用误差提供了可靠的解决方案.
- 开发的计算方法准确地模拟了溶液中的复杂离子的电子结构,这对于地质化学应用至关重要.
- 这项工作验证了FLOSIC用于精确建模同位素行为及其与地球大气历史的关系的使用.
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