NMR Coupling Constants Based on the Bethe-Salpeter Equation in the GW Approximation

被引:25
|
作者
Franzke, Yannick J. [2 ]
Holzer, Christof [3 ]
Mack, Fabian [1 ]
机构
[1] Karlsruhe Inst Technol KIT, Inst Phys Chem, D-76131 Karlsruhe, Germany
[2] Philipps Univ Marburg, Fachbereich Chem, D-35032 Marburg, Germany
[3] Karlsruhe Inst Technol KIT, Inst Theoret Solid State Phys, D-76131 Karlsruhe, Germany
关键词
DENSITY-FUNCTIONAL THEORY; NUCLEAR-MAGNETIC-RESONANCE; RANDOM-PHASE-APPROXIMATION; AUXILIARY BASIS-SETS; GENERALIZED GRADIENT APPROXIMATION; CORRELATED MOLECULAR CALCULATIONS; ELECTRONIC-STRUCTURE CALCULATIONS; CONSISTENT BASIS-SETS; ZETA VALENCE QUALITY; GAUSSIAN-BASIS SETS;
D O I
10.1021/acs.jctc.1c00999
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We present the first steps to extend the Green's function GW method and the Bethe-Salpeter equation (BSE) to molecular response properties such as nuclear magnetic resonance (NMR) indirect spin-spin coupling constants. We discuss both a nonrelativistic one-component and a quasi-relativistic two-component formalism. The latter describes scalar-relativistic and spin-orbit effects and allows us to study heavy-element systems with reasonable accuracy. Efficiency is maintained by the application of the resolution of the identity approximation throughout. The performance is demonstrated using conventional central processing units (CPUs) and modern graphics processing units (GPUs) for molecules involving several thousand basis functions. Our results show that a large amount of Hartree-Fock exchange is vital to provide a sufficient Kohn-Sham starting point to compute the GW quasi-particle energies. As the GW-BSE approach is generally less accurate for triplet excitations or related properties such as the Fermi-contact interaction, the admixture of the Kohn-Sham correlation kernel through the contracted BSE (cBSE) method improves the results for NMR coupling constants. This leads to remarkable results when combined with the eigenvalue-only self-consistent variant (evGW) and Becke's half and half functional (BH&HLYP) or the CAM-QTP family. The developed methodology is used to calculate the Karplus curve of tin molecules, illustrating its applicability to extended chemically relevant molecules. Here, the GW-cBSE method improves upon the chosen BH&HLYP Kohn-Sham starting points.
引用
收藏
页码:1030 / 1045
页数:16
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