Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 11: Atomic clusters I (with MO)
A 11.3: Vortrag
Montag, 29. Februar 2016, 17:30–17:45, f107
Influence of wavelength and pulse duration on single-shot x-ray diffraction patterns from non-spherical nanoparticles — •Katharina Sander1, Christian Peltz1, Charles Varin2, Stefan Scheel1, Thomas Brabec2 und Thomas Fennel1 — 1Institute of Physics, University of Rostock — 2Institute of Physics, University of Ottawa
The availability of intense femtosecond x-ray laser pulses from FELs has made it possible to visualize the structure and dynamics of nanosystems via single-shot diffractive imaging. It has been demonstrated that such experiments can be conducted on single free clusters to measure their size as well as their three-dimensional shape and orientation [1]. To model the corresponding diffraction patterns we use a microscopic model based on the discrete dipole approximation (DDA) [2]. We introduce a complex scaling DDA (CSDDA) and study single-shot x-ray diffraction patterns from non-spherical, absorbing nanotargets in the limit of linear response [3]. We employed the method to the scattering by icosahedral silver clusters and compare the scattering pattern for soft and hard x-ray radiation. Our results confirm that 3D structure information is only accessible for long wavelength, i. e. with soft x-ray pulses, but remains visible even for attosecond pulse durations for which the interference fringes vanish.
[1] I. Barke et al., Nat. Comm. 6, 6187, (2015)
[2] E. M. Purcell et al., Astrophysical Journal 186, 705-714, (1973)
[3] K. Sander et al., J. Phys. B 48, 204004 (2015)