TY  - JOUR
A1  - Vaz da Cruz, Vinícius
A1  - Ignatova, Nina
A1  - Couto, Rafael
A1  - Fedotov, Daniil
A1  - Rehn, Dirk R.
A1  - Savchenko, Viktoriia
A1  - Norman, Patrick
A1  - Ågren, Hans
A1  - Polyutov, Sergey
A1  - Niskanen, Johannes
A1  - Eckert, Sebastian
A1  - Jay, Raphael Martin
A1  - Fondell, Mattis
A1  - Schmitt, Thorsten
A1  - Pietzsch, Annette
A1  - Föhlisch, Alexander
A1  - Odelius, Michael
A1  - Kimberg, Victor
A1  - Gel’mukhanov, Faris
T1  - Nuclear dynamics in resonant inelastic X-ray scattering and X-ray absorption of methanol
T2  - The journal of chemical physics : bridges a gap between journals of physics and journals of chemistr
N2  - We report on a combined theoretical and experimental study of core-excitation spectra of gas and liquid phase methanol as obtained with the use of X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS). The electronic transitions are studied with computational methods that include strict and extended second-order algebraic diagrammatic construction [ADC(2) and ADC(2)-x], restricted active space second-order perturbation theory, and time-dependent density functional theory-providing a complete assignment of the near oxygen K-edge XAS. We show that multimode nuclear dynamics is of crucial importance for explaining the available experimental XAS and RIXS spectra. The multimode nuclear motion was considered in a recently developed "mixed representation" where dissociative states and highly excited vibrational modes are accurately treated with a time-dependent wave packet technique, while the remaining active vibrational modes are described using Franck-Condon amplitudes. Particular attention is paid to the polarization dependence of RIXS and the effects of the isotopic substitution on the RIXS profile in the case of dissociative core-excited states. Our approach predicts the splitting of the 2a RIXS peak to be due to an interplay between molecular and pseudo-atomic features arising in the course of transitions between dissociative core- and valence-excited states. The dynamical nature of the splitting of the 2a peak in RIXS of liquid methanol near pre-edge core excitation is shown. The theoretical results are in good agreement with our liquid phase measurements and gas phase experimental data available from the literature. (C) 2019 Author(s).
Y1  - 2019
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/49006
SN  - 0021-9606
SN  - 1089-7690
VL  - 150
IS  - 23
PB  - American Institute of Physics
CY  - Melville
ER  -