结合密度功能嵌入理论和DMRG-NEVPT2来处理大型活性空间:解决单原子合金中的电子结构复杂性
Phillips Hutchison1, Ziyang Wei1, Emily A Carter1,2
1Department of Mechanical and Aerospace Engineering, Princeton University, 41 Olden Street, Princeton, New Jersey 08544, United States.
Journal of chemical theory and computation
|February 19, 2026
概括
单原子合金 (SAA) 在催化中表现有前途,但准确地建模它们需要先进的计算方法. 本研究引入了嵌入式密度矩阵重规范化组 (DMRG) 方法,以准确计算SAA的吸附能量,克服传统方法的局限性.
科学领域:
- 计算化学是一种计算化学.
- 材料科学是一种材料科学.
- 表面科学是一门科学.
背景情况:
- 由于其独特的电子性质,单原子合金 (SAA) 在异质催化中至关重要.
- 密度函数理论 (DFT) 被广泛使用,但对光和电催化有局限性.
- 密度功能嵌入理论 (DFET) /嵌入式相关波函数 (ECW) 方法可以纠正DFT错误.
研究的目的:
- 开发和应用先进的计算方法来准确建模SAAs.
- 克服复杂电子结构的SAA传统多引用方法的局限性.
- 为了研究各种金属合物Ag100) 表面上的CO吸附.
主要方法:
- 结合DFET/ECW与密度矩阵重规范化组 (DMRG) 方法 (DMRGSCF和DMRG-NEVPT2) 在PySCF代码内.
- 使用嵌入式DMRGSCF和嵌入式DMRG-NEVPT2进行计算.
- 分析了使用不同活性空间对Ni,Rh,Pd和Pt剂的Ag的CO吸附.
主要成果:
- 传统的多参数方法中的活性空间导致了CO的过度结合.
- 通过DMRGSCF和DMRG-NEVPT2实现的更大的活跃空间,提供了精确的无吸附能量.
- 活动空间的选择显著影响计算吸附能量的准确性.
结论:
- 嵌入式DMRG-NEVPT2是研究金属表面的催化反应的强大方法,特别是当需要大大的活性空间时.
- 未来对SAA的多引用计算应该包括所有多剂d轨道和相关的主体金属轨道.
- 这项工作为了解SAA催化提供了一个可靠的计算框架.
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