Exploring fingerprints of ultrafast structural dynamics in molecular solutions with an X-ray laser

Ruslan P. Kurta*, Tim B. van Driel, Asmus O. Dohn, Tim B. Berberich, Silke Nelson, Ivan A. Zaluzhnyy, Nastasia Mukharamova, Dmitry Lapkin, Diana B. Zederkof, Matthew Seaberg, Kasper S. Pedersen, Kasper S. Kjær, Geoffery Ian Rippy, Elisa Biasin, Klaus B. Møller, Luca Gelisio, Kristoffer Haldrup, Ivan A. Vartanyants, Martin M. Nielsen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


We apply ultrashort X-ray laser pulses to track optically excited structural dynamics of [Ir2(dimen)4]2+ molecules in solution. In our exploratory study we determine angular correlations in the scattered X-rays, which comprise a complex fingerprint of the ultrafast dynamics. Model-assisted analysis of the experimental correlation data allows us to elucidate various aspects of the photoinduced changes in the excited molecular ensembles. We unambiguously identify that in our experiment the photoinduced transition dipole moments in [Ir2(dimen)4]2+ molecules are oriented perpendicular to the Ir–Ir bond. The analysis also shows that the ground state conformer of [Ir2(dimen)4]2+ with a larger Ir–Ir distance is mostly responsible for the formation of the excited state. We also reveal that the ensemble of solute molecules can be characterized with a substantial structural heterogeneity due to solvent influence. The proposed X-ray correlation approach offers an alternative path for studies of ultrafast structural dynamics of molecular ensembles in the liquid and gas phases.
Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Issue number35
Pages (from-to)23417-23434
Publication statusPublished - 2023


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