Radiation damage free ghost diffraction with atomic resolution

0500192 - ÚFP 2019 RIV GB eng J - Journal Article
Li, Z. - Medvedev, Nikita - Chapman, H.N. - Shih, Y.
Radiation damage free ghost diffraction with atomic resolution.
Journal of Physics B-Atomic Molecular and Optical Physics. Roč. 51, č. 2 (2018), č. článku 025503. ISSN 0953-4075. E-ISSN 1361-6455
R&D Projects: GA MŠMT(CZ) LM2015083; GA MŠMT LG15013
Institutional support: RVO:61389021
Keywords : x-ray quantum optics * diffraction imaging * atomic resolution
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 2.115, year: 2018
http://iopscience.iop.org/article/10.1088/1361-6455/aa9737/pdf

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 ngstrom. Since the samples are illuminated by low energy optical photons, they can be free of radiation damage.
Permanent Link: http://hdl.handle.net/11104/0292308