Ab initio电子结构和FeH+/2的内部分区总和
Isuru R Ariyarathna1, Jeffery A Leiding1, Amanda J Neukirch1
1Physics and Chemistry of Materials (T-1), Los Alamos National Laboratory, Los Alamos, NM 87545, USA. isuru@lanl.gov.
Physical chemistry chemical physics : PCCP
|December 18, 2024
概括
本研究详细介绍了FeH+和FeH2+的电子状态,使用先进的计算方法,提供关键性质,如结合能和二极子时刻. 结果提供了对它们的光谱带和分区功能的洞察.
科学领域:
- 计算化学的计算化学
- 量子化学 是一个量子化学.
- 频谱学是一种光谱学.
背景情况:
- 了解FeH+和FeH2+等过渡金属化物的电子结构对于各种化学和天体物理应用至关重要.
- 需要准确的理论预测来补充这些分子系统的实验数据.
研究的目的:
- 通过计算来研究27FeH+和6FeH2+电子状态.
- 为了计算潜在能量曲线 (PEC),光谱参数和旋转轨道合.
- 为了确定双极时刻曲线 (DMCs) 和过渡双极时刻曲线 (TDMCs).
主要方法:
- 多参考配置交互 (MRCI) 和合集群单双和扰动三倍 [CCSD(T) ] 波函数理论 (WFT) 的计算.
- 使用了大型四倍-ζ和五倍-ζ相关性一致基准集.
- 使用CCSDT参考数据评估密度函数理论 (DFT) 错误.
主要成果:
- 报告了FeH+和FeH2+状态的PEC,光谱参数和自旋轨道合.
- 确定了FeH+的基本状态为X5Δ,其离离子解离能 (D0) 为~52 kcal mol-1.
- 在FeH2+的多参考4Π和4Δ状态下计算的D0为~22kcal mol-1.
- 观察到改善的双极时刻与更高的流动密度函数近似 (DFAs).
- 预测低电子状态的弱光谱波段,由于低过渡双极时刻.
- 首次呈现了FeH+和FeH2+的内部分区函数总和 (TIPS).
结论:
- 该研究提供了FeH+和FeH2+电子状态的全面理论表征.
- 计算的属性,包括解离能和二极点,为未来的实验和理论研究提供了有价值的数据.
- 关于DFT功能性能和光谱带预测的发现有助于理解这些铁化离子.
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