Femtosecond symmetry breaking and coherent relaxation of methane cations via x-ray spectroscopy

E Ridente, D Hait, EA Haugen, AD Ross, DM Neumark… - Science, 2023 - science.org
Understanding the relaxation pathways of photoexcited molecules is essential to gain
atomistic-level insight into photochemistry. We performed a time-resolved study of ultrafast …

An ab initio study of the rovibronic spectrum of sulphur monoxide (SO): diabatic vs. adiabatic representation

RP Brady, SN Yurchenko, GS Kim… - Physical Chemistry …, 2022 - pubs.rsc.org
We present an ab initio study of the rovibronic spectra of sulphur monoxide (32S16O) using
internally contracted multireference configuration interaction (ic-MRCI) method and aug-cc …

Ultrafast geometrical reorganization of a methane cation upon sudden ionization: an isotope effect on electronic non-equilibrium quantum dynamics

CEM Gonçalves, RD Levine, F Remacle - … Chemistry Chemical Physics, 2021 - pubs.rsc.org
The ultrafast structural, Jahn–Teller (JT) driven, electronic coherence mediated quantum
dynamics in the CH4+ and CD4+ cations that follows sudden ionization using an XUV …

Electronic coherences steer the strong isotope effect in the ultrafast Jahn–Teller structural rearrangement of methane cation upon tunnel ionization

M Blavier, K Komarova, CEM Gonçalves… - The Journal of …, 2021 - ACS Publications
We report on fully quantum electronic-nuclear dynamics following sudden ionization from
the neutral in the three lowest electronic states of the CH4+ and CD4+ cations. There is a …

Computational study of the adamantane cation: simulations of spectroscopy, fragmentation dynamics, and internal conversion

B Roy, E Titov, P Saalfrank - Theoretical Chemistry Accounts, 2023 - Springer
Diamondoids, of which adamantane (C 10 H 16) is the simplest representative, constitute an
intriguing class of carbon based nanomaterials with interesting chemical, mechanical and …

Introducing the new concept of a chiral-polaron giant-IRAV signature, optical-active giant-response in vibrational circular dichroism

F Biffoli, M Bonechi, M Pagliai, M Innocenti… - Physical Chemistry …, 2024 - pubs.rsc.org
Polycyclic aromatic hydrocarbons (PAHs) are a class of compounds of primary importance in
the field of organic semiconductors, with applications in both organic electronics and …

General Formalism of Vibronic Hamiltonians for Tetrahedral and Octahedral Systems: Problems That Involve T, E States and t, e Vibrations

T Zeng, RJ Hickman, A Kadri… - Journal of Chemical Theory …, 2017 - ACS Publications
We derive expansion formulas up to arbitrary order in vibrational coordinates for the
tetrahedral and octahedral vibronic Hamiltonians that involve T and E states, and t and e …

On extracting subfemtosecond data from femtosecond quantum dynamics calculations: the methane cation

T Mondal, AJC Varandas - Journal of chemical theory and …, 2014 - ACS Publications
Motivated by recent measurements of the subfemtosecond structural rearrangement in the
methane cation using high-harmonic generation technology, here, we attempt an ab initio …

An ab initio diabatic study of rovibronic spectra of CN

S Zhang, Z Qin, L Liu - Physical Chemistry Chemical Physics, 2024 - pubs.rsc.org
An ab initio study of the rovibronic spectra for the cyano radical (CN) based on a diabatic
representation is presented. This work considers 17 electronic states, 59 dipole moment …

Helium Nanodroplet Infrared Spectroscopic Studies of CH4+ and 13CH3+

A Singh, SH Allison, AAA Azhagesan… - The Journal of Physical …, 2024 - ACS Publications
In this work, CH4+ cations were formed in helium droplets and investigated with infrared
laser spectroscopy. The observed infrared bands are assigned to the C2v isomer of the …