Pseudospectral implementations of <scp>long‐range</scp> corrected density functional theory
Yixiang Cao, Mathew D. Halls, Tati Reddy Vadicherla, Richard A. Friesner
Abstract
Abstract We have implemented pseudospectral density‐functional theory (DFT) with long‐range corrected DFT functionals (PS‐LRC) in quantum mechanics package Jaguar, and applied it in the calculations of geometry optimizations, dimmer interaction energies, polarizabilities and first‐order hyperpolarizabilities, harmonic vibrational frequencies, S 1 and T 1 excitation energies, singlet‐triplet gaps, charge transfer numbers, oscillator strengths, reaction barrier heights, electron‐transfer couplings, and charge‐transfer excitation energies. From our accuracy benchmark analysis, PS grids, PS dealiasing functions, PS atomic corrections, PS multigrid strategy, PS length scales, and PS cutoff scheme perform well in PS DFT with LRC density functionals with very small and ignorable deviations when compared to the conventional spectral (CS) method. The timing benchmark study of S 1 excitation energy calculations of fullerenes ( C n , n up to 540) demonstrates that PS‐LRC achieves 1.4–8.4‐fold speedups in SCF, 22–32‐fold speedups in Tamm‐Dancoff approximation, and 6–15‐fold speedups in total wall clock time with an average error 0.004 eV of excitation energies compared to the CS method.