Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 30: Atomic Clusters III (joint session A/MO)
A 30.6: Vortrag
Mittwoch, 7. März 2018, 15:15–15:30, K 2.016
Cold and controlled nanoparticle beams for single particle diffractive imaging — •Nils Roth1, Salah Awel1,2, Amit Samanta1, Armando Estillore1, Lena Worbs1,2, Muhamed Amin1, Karol Dlugolecki1, Nicolai Pohlmann1, Daniel Horke1,2, and Jochen Küpper1,2,3,4 — 1Center for Free-Electron Laser Science, DESY, Hamburg, Germany — 2Center for Ultrafast Imaging, Universität Hamburg, Germany — 3Department of Physics, Universität Hamburg, Germany — 4Department of Chemistry, Universität Hamburg, Germany
Coherent diffractive imaging at free-electron lasers promises to allow the reconstruction of the three-dimensional molecular structures of isolated particles at atomic resolution [1]. However, because of the typical low signal to noice ratio, this requires the collection of a large amount of diffraction patterns. Since every intercepted particle is destroyed by the intense x-ray pulse, a new and preferably identical sample particle has to be delivered into every pulse. Currently the inefficient delivery of particles and the correspondingly low number of strong diffraction patterns collected during typical beam times is one of the major limiting factors. With the aid of numerical simulations we developed new aerodynamic devices, such as aerodynamic lenses and buffer-gas cells, to produce cold and high-density beams of nanoparticles, e.g., viruses. We benchmark developed injectors in our aerosol beam characterisation setup, using novel laser-based particle detection schemes.
[1] M. M. Seibert, et al, Nature 470, 78 (2011).