Erlangen 2018 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 17: Posters 2: Cold Molecules and Clusters

MO 17.17: Poster

Mittwoch, 7. März 2018, 16:15–18:15, Orangerie

3D high resolution diffractive imaging of individual silver clusters — •J. Jordan¹, B. Langbehn¹, A. Ulmer¹, J. Zimmermann^{5, 1}, S. Dold², B. v. Issendorff², I. Barke³, H. Hartmann³, F. Martinez³, K. Oldenburg³, K. Meiwes-Broer³, T. Fennel³, C. Bomme⁴, J. Correa⁴, S. Düsterer⁴, B. Erk⁴, B. Manschwetus⁴, R. Treusch⁴, T. Möller¹, and D. Rupp^1,5 — ¹TU Berlin — ²U. Freiburg — ³U. Rostock — ⁴FLASH@DESY — ⁵MBI Berlin

Short-wavelength free-electron lasers (FELs) have opened a window into the nano cosmos. Their high intensity and short pulse duration allow capturing of high resolution ”snapshots” of single nanometer-sized objects in free flight. Single silver clusters, created by a magnetron sputter source in a broad size distribution, were imaged in a diffraction before destruction approach using extreme ultraviolet (XUV) and soft x-ray pulses from the FEL in Hamburg (FLASH). In a previous work, a large variety of structural motifs were identified by using wide angle diffraction [Barke et al., Nat. Comm. 6 (2015)]. There, the scattering signal at large angles, which contains 3D information on particle shape and orientation, was recorded in the XUV regime. However, the use of long wavelengths decreases spatial resolution. In this work, scattering images obtained at 5 nm and 13.6 nm were compared to test whether 3D information can be reliably extracted at short wavelengths while maintaining high resolution. This is key to time resolved imaging studies on light-induced electronic excitation and ultrafast melting of metal clusters, which will be further explored in an upcoming experiment.