SAMOP 2023 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 21: Molecular Physics with X-rays
MO 21.8: Vortrag
Freitag, 10. März 2023, 12:45–13:00, F102
X-FEL induced Coulomb explosion: Advanced analysis of coincident ion momenta — •Benoît Richard1,2,3, Robin Santra1,2,3, and Ludger Inhester1,2,3 — 1CFEL, DESY, Hamburg, Germany — 2CUI, Hamburg, Germany — 3Universität Hamburg, Hamburg, Germany
Intense x-ray pulses from x-ray free-electron lasers (X-FEL) ionize small molecular systems leading to their violent dissociation into several atomic fragments on a femtosecond time scale. Recent experiments with the 2-iodopyridine molecule have demonstrated that measuring the momenta of only 3 fragments in coincidence is sufficient to distinguish individual ion contributions. [1] However, combining all the different n-particle coincidence data, where in each a different subset of ion fragments is detected, into a joint distribution is not trivial.
We present a general method to perform such analysis. We demonstrate its application using simulation data of the X-FEL-induced Coulomb explosion of 2-iodopyridine and use it to extract correlations between ion momenta. We show that such correlations contain fingerprints of collisions during the explosion. [2] Moreover, we demonstrate that this data is related to the structure of the molecule just before being hit by the x-ray pulse that destroyed it.
[1] R. Boll, J. Schäfer, B. Richard et al. 2022. Nat. Phys. 18, 423-428
[2] B. Richard et al. 2021. J. Phys. B: At. Mol. Opt. Phys. 54 194001