Gaussian Basis Sets for All-Electron Excited-State Calculations of Large Molecules.

ABSTRACT: We introduce a family of all-electron Gaussian basis sets, augmented MOLOPT, optimized for excited-state calculations on large molecules. We generate these basis sets by augmenting existing STO-3G, STO-6G, and MOLOPT basis sets optimized for ground state energy calculations. The augmented MOLOPT basis sets achieve fast convergence of GW gaps and Bethe-Salpeter excitation energies, while maintaining low condition numbers of the overlap matrix to ensure numerical stability. For GW HOMO-LUMO gaps, the double-ζ augmented MOLOPT basis yields a mean absolute deviation of 60 meV to the complete basis set limit. The basis set convergence for excitation energies from time-dependent density functional theory and the Bethe-Salpeter equation is similar. We use our smallest generated augm

SUBMITTER: Pasquier R 

PROVIDER: S-EPMC12805578 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature