Computational approaches for XANES, VtC-XES, and RIXS using linear-response time-dependent density functional theory based methods

DR Nascimento, N Govind - Physical Chemistry Chemical Physics, 2022‏ - pubs.rsc.org
The emergence of state-of-the-art X-ray light sources has paved the way for novel
spectroscopies that take advantage of their atomic specificity to shed light on fundamental …

XABOOM: An X-ray absorption benchmark of organic molecules based on carbon, nitrogen, and oxygen 1s→ π* transitions

T Fransson, IE Brumboiu, ML Vidal… - Journal of Chemical …, 2021‏ - ACS Publications
The performance of several standard and popular approaches for calculating X-ray
absorption spectra at the carbon, nitrogen, and oxygen K-edges of 40 primarily organic …

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 …

New and efficient implementation of CC3

AC Paul, RH Myhre, H Koch - Journal of chemical theory and …, 2020‏ - ACS Publications
We present a new and efficient implementation of the closed shell coupled cluster singles
and doubles with perturbative triples method (CC3) in the electronic structure program e T …

Accurate core excitation and ionization energies from a state-specific coupled-cluster singles and doubles approach

JE Arias-Martinez, LA Cunha, KJ Oosterbaan… - Physical Chemistry …, 2022‏ - pubs.rsc.org
We investigate the use of orbital-optimized references in conjunction with single-reference
coupled-cluster theory with single and double substitutions (CCSD) for the study of core …

Combining the Δ-Self-Consistent-Field and GW Methods for Predicting Core Electron Binding Energies in Periodic Solids

JM Kahk, J Lischner - Journal of Chemical Theory and …, 2023‏ - ACS Publications
For the computational prediction of core electron binding energies in solids, two distinct
kinds of modeling strategies have been pursued: the Δ-Self-Consistent-Field method based …

Relativistic EOM-CCSD for core-excited and core-ionized state energies based on the four-component Dirac–Coulomb (− Gaunt) Hamiltonian

L Halbert, ML Vidal, A Shee, S Coriani… - Journal of Chemical …, 2021‏ - ACS Publications
We report an implementation of the core–valence separation approach to the four-
component relativistic Hamiltonian-based equation-of-motion coupled-cluster with singles …

Core binding energy calculations: A scalable approach with the quantum embedding-based equation-of-motion coupled-cluster method

B Jangid, MR Hermes, L Gagliardi - The Journal of Physical …, 2024‏ - ACS Publications
We investigated the use of density matrix embedding theory to facilitate the computation of
core ionization energies (IPs) of large molecules at the equation-of-motion coupled-cluster …

Toward quantum computing for high-energy excited states in molecular systems: quantum phase estimations of core-level states

NP Bauman, H Liu, EJ Bylaska… - Journal of chemical …, 2020‏ - ACS Publications
This paper explores the utility of the quantum phase estimation (QPE) algorithm in
calculating high-energy excited states characterized by the promotion of electrons …

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 …