title: Energy-Specific Linear Response TDHF/TDDFT for Calculating High-Energy Excited States.
abstract: An energy-specific TDHF/TDDFT method is introduced in this article for excited state calculations. This approach extends the conventional TDHF/TDDFT implementation to obtain excited states above a predefined energy threshold. The method introduced and developed in this work enables computationally efficient yet rigorous calculations of energy-specific spectra, e.g., X-ray absorption involving extremely high-energy transitions. All transitions are solved in the full molecular orbital space, and orthogonality to the ground state and lower-lying excited states is preserved for each high-energy excited state. Encouraging computational savings are observed in calculating the targeted energy spectrum, while the transition energies, as well as oscillator strengths, remain identical to the results from the standard implementation.
authors.affiliation: Department of Chemistry, University of Washington , Seattle, Washington, United States 98195.
authors.forename: Wenkel
authors.initials: W
authors.lastname: Liang
authors.affiliation: Department of Chemistry, University of Washington , Seattle, Washington, United States 98195.
authors.forename: Sean A
authors.initials: SA
authors.lastname: Fischer
authors.affiliation: Gaussian, Inc. , 340 Quinnipiac St Bldg 40, Wallingford, Connecticut 06492, United States.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Frisch
authors.affiliation: Department of Chemistry, University of Washington , Seattle, Washington, United States 98195.
authors.forename: Xiaosong
authors.initials: X
authors.lastname: Li