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MO: Fachverband Molekülphysik
MO 4: Cold Molecules & Helium Droplets 1
MO 4.1: Vortrag
Montag, 29. Februar 2016, 14:30–14:45, f142
Optimized-focusing injector for single-particle coherent diffractive x-ray imaging — •Nils Roth1,3, Tim Ossenbrüggen1, Bernd Lienau3, Daniel Horke1,2, and Jochen Küpper1,2,3 — 1Center for Free-Electron Laser Science, DESY, Hamburg, Germany — 2The Hamburg Center for Ultrafast Imaging, University of Hamburg, Germany — 3Department of Physics, University of Hamburg, Germany
Atomic resoulution single-particle coherent diffractive imaging requires reproducible particles to build up a 3D molecular image [1]. Current experiments are limited by the inefficient delivery of particles and correspondingly low hit-rates, i.e., poor usage of sample and x-ray photons. We are developing a controllable and efficient vaporization and aerodynamic lens [2] system to provide tightly focused beams of nanoparticles and biological systems, which will efficiently be guided to the interaction point. Here, we present detailed numerical simulations, as well as experimental characterization, of such particle injectors. Using in-vacuum microscopes and light scattering we are able to determine the size of the produced particle beam. The distribution of gas from nozzles and particle injectors is studied quantitatively using plasma-formation imaging. This yields an accurate pressure-distribution map, important for benchmarking simulations. The increased hit-rate achieved in such a setup will make "molecular-movie" experiments more likely.
[1] Barty et al., Annu. Rev. Phys. Chem. 64 415-435 (2013),
[2] Lui et al., Aerosol Sci. Technol. 22 293-313 (1995a)