X-ray absorption of molecular cations—a new challenge for electronic structure theory

V Carravetta, RC Couto, H Ågren - Journal of Physics …, 2022 - iopscience.iop.org
In this paper we put forward some historical notes on the development of computational
chemistry toward applications of x-ray spectroscopies. We highlight some of the important …

Chemical influence of carbon interface layers in metal/oxide resistive switches

DY Cho, K Kim, KS Lee, M Lubben… - ACS applied materials …, 2023 - ACS Publications
Thin layers introduced between a metal electrode and a solid electrolyte can significantly
alter the transport of mass and charge at the interfaces and influence the rate of electrode …

Tuning UV Pump X-ray Probe Spectroscopy on the Nitrogen K Edge Reveals the Radiationless Relaxation of Pyrazine: Ab Initio Simulations Using the Quasiclassical …

T Kaczun, AL Dempwolff, X Huang… - The Journal of …, 2023 - ACS Publications
Transient absorption UV pump X-ray probe spectroscopy has been established as a
versatile technique for the exploration of ultrafast photoinduced dynamics in valence-excited …

Spin Coupling Effect on Geometry-Dependent X-Ray Absorption of Diradicals

SM Garner, EA Haugen, SR Leone… - Journal of the …, 2024 - ACS Publications
We theoretically investigate the influence of diradical electron spin coupling on the time-
resolved X-ray absorption spectra of the photochemical ring opening of furanone. We predict …

Interplay of open-shell spin-coupling and Jahn–Teller distortion in benzene radical cation probed by x-ray spectroscopy

ML Vidal, M Epshtein, V Scutelnic, Z Yang… - The Journal of …, 2020 - ACS Publications
We report a theoretical investigation and elucidation of the X-ray absorption spectra of
neutral benzene and of the benzene cation. The generation of the cation by multiphoton …

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 …

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 …

A QM/MM study on the x-ray spectra of organic proton transfer crystals of isonicotinamides

G Ge, JR Zhang, SY Wang, M Wei… - The Journal of Physical …, 2022 - ACS Publications
Proton transfer (PT) in organic crystals creates localized charges and strong hydrogen
bonding (HB), making the self-consistent field (SCF) calculation of core-ionized and core …

Theoretical calculation of core-excited states along dissociative pathways beyond second-order perturbation theory

M Huang, C Li, FA Evangelista - Journal of Chemical Theory and …, 2021 - ACS Publications
We extend the multireference driven similarity renormalization (MR-DSRG) method to
compute core-excited states by combining it with a GASSCF treatment of orbital relaxation …

Table-top X-ray spectroscopy of benzene radical cation

M Epshtein, V Scutelnic, Z Yang, T Xue… - The Journal of …, 2020 - ACS Publications
Ultrafast table-top X-ray spectroscopy at the carbon K-edge is used to measure the X-ray
spectral features of benzene radical cations (Bz+). The ground state of the cation is prepared …