Rostock 2019 – scientific programme

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A: Fachverband Atomphysik

A 19: Cluster I (joint session A/MO)

A 19.7: Talk

Wednesday, March 13, 2019, 16:00–16:15, S HS 3 Physik

Ultrafast Ionization Dynamics of Methane Clusters — •A. Heilrath¹, M. Sauppe^1,2, K. Kolatzki^1,2, B. Langbehn¹, B. Senfftleben², A. Ulmer¹, J. Zimmermann^1,2, L. Flückiger³, T. Gorkhover⁴, C. Bostedt⁵, Y. Kumagai⁶, S. Düsterer⁷, B. Erk⁷, C. Passow⁷, D. Ramm⁷, D. Rolles^7,8, D. Rompotis⁷, R. Treusch⁷, T. Feigl⁹, T. Möller¹, and D. Rupp^1,2 — ¹Technische 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.