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Exploring Ground and Excited States Via Single Reference Coupled-Cluster Theory and Algebraic Geometry
Journal of Chemical Theory and Computation ( IF 5.7 ) Pub Date : 2024-09-17 , DOI: 10.1021/acs.jctc.4c00644 Svala Sverrisdóttir 1 , Fabian M Faulstich 2
Journal of Chemical Theory and Computation ( IF 5.7 ) Pub Date : 2024-09-17 , DOI: 10.1021/acs.jctc.4c00644 Svala Sverrisdóttir 1 , Fabian M Faulstich 2
Affiliation
The exploration of the root structure of coupled cluster (CC) equations holds both foundational and practical significance for computational quantum chemistry. This study provides insight into the intricate root structures of these nonlinear equations at both the CCD and CCSD level of theory. We utilize computational techniques from algebraic geometry, specifically the monodromy and parametric homotopy continuation methods, to calculate the full solution set. We compare the computed CC roots against various established theoretical upper bounds, shedding light on the accuracy and efficiency of these bounds. We hereby focus on the dissociation processes of four-electron systems such as (H2)2 in both D2h and D∞h configurations, H4 symmetrically distorted on a circle, and lithium hydride. We moreover investigate the ability of single-reference CC solutions to approximate excited state energies. We find that multiple CC roots describe energies of excited states with high accuracy. Our investigations reveal that for systems like lithium hydride, CC not only provides high-accuracy approximations to several excited state energies but also to the states themselves.
中文翻译:
通过单参考耦合簇理论和代数几何探索基态和激发态
探索耦合簇 (CC) 方程的根结构对于计算量子化学具有基础和实际意义。这项研究提供了在 CCD 和 CCSD 理论层面上对这些非线性方程的复杂根结构的见解。我们利用代数几何的计算技术,特别是单向和参数同伦延拓方法,来计算完整的解集。我们将计算出的 CC 根与各种已建立的理论上限进行比较,从而阐明这些边界的准确性和效率。我们在此重点介绍四电子系统的解离过程,例如 D2h 和 D∞h 构型的 (H2)2、在圆上对称扭曲的 H4 和氢化锂。此外,我们还研究了单参考 CC 解近似激发态能量的能力。我们发现多个 CC 根高精度地描述了激发态的能量。我们的研究表明,对于氢化锂等系统,CC 不仅提供了几种激发态能量的高精度近似值,还提供了态本身的高精度近似值。
更新日期:2024-09-17
中文翻译:
通过单参考耦合簇理论和代数几何探索基态和激发态
探索耦合簇 (CC) 方程的根结构对于计算量子化学具有基础和实际意义。这项研究提供了在 CCD 和 CCSD 理论层面上对这些非线性方程的复杂根结构的见解。我们利用代数几何的计算技术,特别是单向和参数同伦延拓方法,来计算完整的解集。我们将计算出的 CC 根与各种已建立的理论上限进行比较,从而阐明这些边界的准确性和效率。我们在此重点介绍四电子系统的解离过程,例如 D2h 和 D∞h 构型的 (H2)2、在圆上对称扭曲的 H4 和氢化锂。此外,我们还研究了单参考 CC 解近似激发态能量的能力。我们发现多个 CC 根高精度地描述了激发态的能量。我们的研究表明,对于氢化锂等系统,CC 不仅提供了几种激发态能量的高精度近似值,还提供了态本身的高精度近似值。