Understanding X-ray absorption in liquid water using triple excitations in multilevel coupled cluster theory

SD Folkestad, AC Paul, R Paul, S Coriani… - Nature …, 2024 - nature.com
X-ray absorption (XA) spectroscopy is an essential experimental tool to investigate the local
structure of liquid water. Interpretation of the experiment poses a significant challenge and …

Femtosecond Core-Level Spectroscopy Reveals Involvement of Triplet States in the Gas-Phase Photodissociation of Fe(CO)5

J Troß, JE Arias-Martinez, K Carter-Fenk… - Journal of the …, 2024 - ACS Publications
Excitation of iron pentacarbonyl [Fe (CO) 5], a prototypical photocatalyst, at 266 nm causes
the sequential loss of two CO ligands in the gas phase, creating catalytically active …

The landscape of computational approaches for artificial photosynthesis

KR Yang, GW Kyro, VS Batista - Nature Computational Science, 2023 - nature.com
Artificial photosynthesis is an attractive strategy for converting solar energy into fuels, largely
because the Earth receives enough solar energy in one hour to meet humanity's energy …

Calibrating TDDFT calculations of the X-ray emission spectrum of liquid water: The effects of Hartree–Fock exchange

T Fransson, LGM Pettersson - Journal of Chemical Theory and …, 2023 - ACS Publications
The structure and dynamics of liquid water continue to be debated, with insight provided by,
among others, X-ray emission spectroscopy (XES), which shows a split in the high-energy …

On the choice of reference orbitals for linear-response calculations of solution-phase K-edge X-ray absorption spectra

K Carter-Fenk, M Head-Gordon - Physical Chemistry Chemical Physics, 2022 - pubs.rsc.org
The simplest response theory methods for computing vertical excitation spectra in
condensed-phase are configuration interaction with single excitations (CIS) and linear …

Fractional-electron and transition-potential methods for core-to-valence excitation energies using density functional theory

S Jana, JM Herbert - Journal of Chemical Theory and …, 2023 - ACS Publications
Methods for computing X-ray absorption spectra based on a constrained core hole (possibly
containing a fractional electron) are examined. These methods are based on Slater's …

Generalization of One-Center Nonorthogonal Configuration Interaction Singles to Open-Shell Singlet Reference States: Theory and Application to Valence-Core …

JE Arias-Martinez, H Wu… - Journal of Chemical …, 2024 - ACS Publications
We formulate a one-center nonorthogonal configuration interaction singles (1C-NOCIS)
theory for the computation of core excited states of an initial singlet state with two unpaired …

Toward a correct treatment of core properties with local hybrid functionals

M Haasler, TM Maier, M Kaupp - Journal of Computational …, 2023 - Wiley Online Library
In local hybrid functionals (LHs), a local mixing function (LMF) determines the position‐
dependent exact‐exchange admixture. We report new LHs that focus on an improvement of …

Excited-State Dynamics during Primary C–I Homolysis in Acetyl Iodide Revealed by Ultrafast Core-Level Spectroscopy

J Troß, K Carter-Fenk, NC Cole-Filipiak… - The Journal of …, 2023 - ACS Publications
In typical carbonyl-containing molecules, bond dissociation events follow initial excitation to
nπ C═ O* states. However, in acetyl iodide, the iodine atom gives rise to electronic states …

A DFT/MRCI Hamiltonian parameterized using only ab initio data. II. Core-excited states

TS Costain, JB Rolston, SP Neville… - The Journal of Chemical …, 2024 - pubs.aip.org
A newly parameterized combined density functional theory and multi-reference configuration
interaction (DFT/MRCI) Hamiltonian, termed core-valence separation (CVS)-QE12, is …