A theoretical study of the time-resolved x-ray absorption spectrum of the photoionized BT-1T cation

Anna Kristina Schnack-Petersen, Mátyás Pápai, Sonia Coriani, Klaus Braagaard Møller*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

35 Downloads (Pure)


The time-resolved x-ray absorption spectrum of the BT-1T cation (BT-1T+) is theoretically simulated in order to investigate the charge transfer reaction of the system. We employ both trajectory surface hopping and quantum dynamics to simulate the structural evolution over time and the changes in the state populations. To compute the static x-ray absorption spectra (XAS) of the ground and excited states, we apply both the time-dependent density functional theory and the coupled cluster singles and doubles method. The results obtained are in good agreement between the methods. It is, furthermore, found that the small structural changes that occur during the reaction have little effect on the static XAS. Hence, the tr-XAS can be computed based on the state populations determined from a nuclear dynamics simulation and one set of static XAS calculations, utilizing the ground state optimized geometry. This approach can save considerable computational resources, as the static spectra need not to be calculated for all geometries. As BT-1T is a relatively rigid molecule, the outlined approach should only be considered when investigating non-radiative decay processes in the vicinity of the Franck-Condon point.

Original languageEnglish
Article number034102
JournalStructural Dynamics
Issue number3
Number of pages15
Publication statusPublished - 2023


Dive into the research topics of 'A theoretical study of the time-resolved x-ray absorption spectrum of the photoionized BT-1T cation'. Together they form a unique fingerprint.

Cite this