Radiation damage free ghost diffraction with atomic resolution

Li, Z.; Medvedev, N.; Chapman, H. N.; Shih, Y.

doi:10.1088/1361-6455/aa9737

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学術論文

Radiation damage free ghost diffraction with atomic resolution

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Li, Z.
International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science, DESY;
SLAC National Accelerator Laboratory, Menlo Park;

Medvedev, N.
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Institute of Physics and Institute of Plasma Physics, Academy of Science of Czech Republic;

Chapman, H. N.
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Hamburg Centre for Ultrafast Imaging;
Department of Physics, University of Hamburg;

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https://dx.doi.org/10.1088/1361-6455/aa9737
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Li_2018_J._Phys._B__At._Mol._Opt._Phys._51_025503.pdf
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引用

Li, Z., Medvedev, N., Chapman, H. N., & Shih, Y. (2018). Radiation damage free ghost diffraction with atomic resolution. Journal of Physics B: Atomic, Molecular and Optical Physics, 51(2):. doi:10.1088/1361-6455/aa9737.

引用: https://hdl.handle.net/21.11116/0000-0005-E103-9

要旨

The x-ray free electron lasers can enable diffractive structural determination of protein nanocrystals and single molecules that are too small and radiation-sensitive for conventional x-ray diffraction. However the electronic form factor may be modified during the ultrashort x-ray pulse due to photoionization and electron cascade caused by the intense x-ray pulse. For general x-ray imaging techniques, the minimization of the effects of radiation damage is of major concern to ensure reliable reconstruction of molecular structure. Here we show that radiation damage free diffraction can be achieved with atomic spatial resolution by using x-ray parametric down-conversion and ghost diffraction with entangled photons of x-ray and optical frequencies. We show that the formation of the diffraction patterns satisfies a condition analogous to the Bragg equation, with a resolution that can be as fine as the crystal lattice length scale of several Ångstrom. Since the samples are illuminated by low energy optical photons, they can be free of radiation damage.