A1 Refereed original research article in a scientific journal
Nuclear dynamics in resonant inelastic X-ray scattering and X-ray absorption of methanol
Authors: da Cruz VV, Ignatova N, Couto RC, Fedotov DA, Rehn DR, Savchenko V, Norman P, Agren H, Polyutov S, Niskanen J, Eckert S, Jay RM, Fondell M, Schmitt T, Pietzsch A, Fohlisch A, Gel'mukhanov F, Odelius M, Kimberg V
Publisher: AMER INST PHYSICS
Publication year: 2019
Journal: Journal of Chemical Physics
Journal name in source: JOURNAL OF CHEMICAL PHYSICS
Journal acronym: J CHEM PHYS
Article number: ARTN 234301
Volume: 150
Issue: 23
Number of pages: 20
ISSN: 0021-9606
eISSN: 1089-7690
DOI: https://doi.org/10.1063/1.5092174
Web address : https://aip.scitation.org/doi/10.1063/1.5092174
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/41240056
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).
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