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Rostock 2019 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 16: Cluster I (joint session A/MO)

MO 16.7: Vortrag

Mittwoch, 13. März 2019, 16:00–16:15, S HS 3 Physik

Ultrafast Ionization Dynamics of Methane Clusters — •A. Heilrath1, M. Sauppe1,2, K. Kolatzki1,2, B. Langbehn1, B. Senfftleben2, A. Ulmer1, J. Zimmermann1,2, L. Flückiger3, T. Gorkhover4, C. Bostedt5, Y. Kumagai6, S. Düsterer7, B. Erk7, C. Passow7, D. Ramm7, D. Rolles7,8, D. Rompotis7, R. Treusch7, T. Feigl9, T. Möller1, and D. Rupp1,21Technische Universität Berlin — 2Max-Born-Institut, Berlin — 3La Trobe University, Australia — 4SLAC Menlo Park, USA — 5Paul Scherrer Institut, Switzerland — 6Argonne National Lab, USA — 7FLASH@DESY — 8Kansas State University, USA — 9optiX fab, Jena

Intense short wavelength femtosecond pulses from free-electron lasers (FELs) allow to study individual nanoparticles with high resolution in time and space. Exposing samples to intense extreme ultraviolet (XUV) pulses is inevitably linked to ionization and subsequent disintegration of the sample, limiting the accuracy of diffraction imaging. Molecular clusters are an ideal sample system to approach light-induced dynamics of large heteronuclear systems. We studied methane clusters in an XUV pump - XUV probe experiment with 90 eV photon energy at CAMP@FLASH with delays up to 650 ps. Ionic fragments were measured with a time-of-flight spectrometer and diffraction images were taken simultaneously. The ion spectra exhibit a variety of fragments, including higher adducts forming in molecular recombination processes. A general increase of the ion yield with delay as well as the delay-dependencies of fragments will be discussed.

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