Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 12: Experimental Techniques 2

MO 12.2: Vortrag

Mittwoch, 19. März 2014, 14:30–14:45, BEBEL SR144

X-ray diffraction from aligned gas-phase molecules with a free-electron laser — •Stephan Stern1,2, Jochen Küpper1,2, Henry N. Chapman1,2, and Daniel Rolles11Center for Free-Electron Laser Science (CFEL), DESY, Hamburg, Germany — 2University of Hamburg, Hamburg, Germany

We report experimental results on x-ray diffraction of state-selected and aligned ensembles of the prototypical molecule 2,5-diiodobenzonitrile using the Linac Coherent Light Source. The results confirm necessary steps toward x-ray diffractive imaging of such weakly-scattering molecular samples: the ability to provide quantum-state selected ensembles of molecules, to strongly laser-align these, and to perform single-photon detection with the photon detector, even above severe background levels. The approach is suitable for studying ultrafast dynamics of small isolated molecules utilizing the femtosecond x-ray pulses from XFELs together with femtosecond pulses from optical lasers in future pump-probe experiments.

This work was carried within a collaboration, for which J. Küpper, H. Chapman and D. Rolles are spokespersons. The collaboration consists of CFEL (DESY, MPG, University Hamburg), Fritz-Haber-Institute Berlin, MPI Nuclear Physics Heidelberg, MPG Seminconductor Lab, Aarhus University, FOM AMOLF Amsterdam, Lund University, MPI Medical Research Heidelberg, TU Berlin, Max Born Institute Berlin, and SLAC Menlo Park, USA. The experiments were carried out using CAMP (designed and built by the MPG-ASG at CFEL) at the LCLS (operated by Stanford University on behalf of the US DOE.)

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