Photoionization and core resonances from range-separated time-dependent density-functional theory for open-shell states: Example of the lithium atom
Abstract
We consider the calculations of photoionization spectra and core resonances of open-shell systems using range-separated time-dependent density-functional theory. Specifically, we use the time-dependent range-separated hybrid (TDRSH) scheme, combining a long-range Hartree-Fock (HF) exchange potential and kernel with a short-range potential and kernel from a local density-functional approximation, and the time-dependent locally range-separated hybrid (TDLRSH) scheme, which uses a local range-separation parameter. To efficiently perform the calculations, we formulate a spin-unrestricted linear-response Sternheimer approach in a non-orthogonal B-spline basis set and using appropriate frequency-dependent boundary conditions. We illustrate this approach on the Li atom, which suggests that TDRSH and TDLRSH are adequate simple methods for estimating single-electron photoionization spectra of open-shell systems.
Keywords
Cite
@article{arxiv.2211.07179,
title = {Photoionization and core resonances from range-separated time-dependent density-functional theory for open-shell states: Example of the lithium atom},
author = {Julien Toulouse and Karno Schwinn and Felipe Zapata and Antoine Levitt and Eric Cancès and Eleonora Luppi},
journal= {arXiv preprint arXiv:2211.07179},
year = {2023}
}
Comments
arXiv admin note: substantial text overlap with arXiv:2203.05951