SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 27: Poster III

A 27.39: Poster

Thursday, March 9, 2023, 16:30–19:00, Empore Lichthof

Imaging the Morphology of Rare Gas Clusters — •Mario Sauppe¹, Andre Al Haddad², Alessandro Colombo¹, Linos Hecht¹, Gregor Knopp², Katharina Kolatzki¹, Bruno Langbehn³, Caner Polat¹, Kirsten Schnorr², Zhibin Sun², Paul Tümmler⁴, Carl Frederic Ussling¹, Simon Wächter¹, Alex Weitnauer¹, Julian Zimmermann¹, Maha Zuod¹, Thomas Möller³, Christoph Bostedt², and Daniela Rupp¹ — ¹ETH Zurich — ²PSI Switzerland — ³TU Berlin — ⁴Uni Rostock

Rare gas clusters are an ideal testbed to probe the interaction of intense light with matter, in theoretical and experimental approaches. The dynamics may be altered by the clusters' structure, differing from an assumed ideal shape. Short wavelength free-electron lasers (FEL) allow to retrieve real-space images of nano-sized particles via coherent diffraction imaging (CDI). Recent CDI studies have shown that large rare gas clusters (100 nm radius), produced by a supersonic gas expansion, can have rather complex structures, not necessarily following an icosahedral or spherical shape, as known for smaller clusters. Instead, they may be agglomerates of two or three spheres or have a hailstone-like structure. To investigate the structure with a high spatial resolution, we performed a CDI-experiment on argon clusters at the SwissFEL with photon energies of up to 1 keV (1.24 nm). We find a great variety of structures, like complex agglomerates and protrusions connected to the main cluster only via a few nanometers thin neck, not contained in the current picture of cluster growth.