Erlangen 2018 – scientific programme

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MO: Fachverband Molekülphysik

MO 17: Posters 2: Cold Molecules and Clusters

MO 17.18: Poster

Wednesday, March 7, 2018, 16:15–18:15, Orangerie

Ionization dynamics of methane clusters — •A. Heilrath¹, M. Sauppe¹, K. Kolatzki^1,2, B. Langbehn¹, B. Senfftleben¹, A. Ulmer¹, J. Zimmermann^1,2, L. Flückiger³, T. Gorkhover^1,4, C. Bostedt^5,6, Y. Kumagai⁵, C. Bomme⁷, S. Düsterer⁷, B. Erk⁷, M. Kuhlmann⁷, C. Passow⁷, D. Rolles^7,8, D. Rompotis⁷, S. Toleikis⁷, R. Treusch⁷, T. Feigl⁹, T. Möller¹, and D. Rupp^1,2 — ¹TU Berlin — ²MBI Berlin — ³La Trobe University, Melbourne, Australia — ⁴SLAC Menlo Park, USA — ⁵Argonne National Lab, USA — ⁶Northwestern University, USA — ⁷FLASH@DESY — ⁸Kansas State University, USA — ⁹optiX fab, Jena

Coherent diffraction experiments using intense femtosecond short-wavelength pulses from free-electron lasers (FEL) allow to determine the structure and dynamics of individual nanoparticles. The ultrafast ionization and fragmentation dynamics of large methane clusters were studied using intense XUV double pulses from the split-and-delay unit DESC at the FLASH FEL (DESY Hamburg). With each double pulse both the cluster's initial state, and 35-650 picoseconds later the ionized state, are imaged separately on a two-detector setup. Ionic fragments are measured in coincidence with a time-of-flight spectrometer. Methane clusters, as heterogeneous model systems for biomolecules, reveal rich dynamics of higher adducts [Iwan et al. (2012) PRA 86, 033201], unobserved in molecular methane or homogeneous clusters. The dependence of the ion spectra on cluster size and time delay will be discussed.