Hannover 2010 – wissenschaftliches Programm

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SYDI: Symposium Diffractive Imaging

SYDI 2: Diffractive Imaging of complex molecules in the gas-phase

SYDI 2.4: Hauptvortrag

Freitag, 12. März 2010, 15:30–16:00, E 415

Ultrafast processes and imaging of clusters — •Thomas Möller — IOAP, Technische Universität Berlin

The understanding of the interaction of high intensity, short-wavelength, short-pulse radiation with matter is essential for virtually all experiments with new superintense X-ray sources [1], in particular for flash imaging of nm sized particles. Clusters as a form of matter intermediate between atoms and bulk solids are ideal samples to study fundamental light matter interaction processes. They are finite systems with the density of bulk solids allowing the investigation of inner- and interatomic phenomena. Very recently, initial experiments have shown that in nm-sized gas phase particles can be imaged by single shot scattering. X-ray lasers and advanced detectors [2] allow improving the resolution and going to smaller particles. This opens new fields in cluster and nanometer-scale science. Ultrafast electron and ion dynamics can be studied with nm spatial resolution by means of time-resolved scattering using pump-probe techniques as well as time of flight spectroscopy [3].

[1] Bostedt, C. et al. Experiments at FLASH. Nucl. Instr. Meth. 601, 108-122 (2009).

[2] Strüder, L. et al. Large-Format, High-Speed, X-ray pnCCDs Combined with Electron and Ion Imaging Spectrometers in a Multipurpose Chamber for Experiments at 4th Generation Light Sources. Nucl. Instr. Meth. A, accepted (2009).

[3] Bostedt, C. et al. Multistep ionization of argon clusters in intense femtosecond extreme ultraviolet pulses. Phys. Rev. Lett. 100 (2008).