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Soft X-ray diffraction patterns measured by a LiF detector with sub-micrometre resolution and an ultimate dynamic range
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- Makarov, Sergey (author)
- Sternberg Astronomical Institute,Joint Institute for High Temperatures, RAS
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- Pikuz, Sergey (author)
- National Research Nuclear University MEPhI,Joint Institute for High Temperatures, RAS
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- Ryazantsev, Sergey (author)
- Joint Institute for High Temperatures, RAS
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- Buzmakov, Alexey (author)
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- (creator_code:org_t)
- 2020
- 2020
- English 8 s.
- In: Journal of Synchrotron Radiation. - 0909-0495. ; 27, s. 625-632
- Journal article (peer-reviewed)
Abstract
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- The unique diagnostic possibilities of X-ray diffraction, small X-ray scattering and phase-contrast imaging techniques applied with high-intensity coherent X-ray synchrotron and X-ray free-electron laser radiation can only be fully realized if a sufficient dynamic range and/or spatial resolution of the detector is available. In this work, it is demonstrated that the use of lithium fluoride (LiF) as a photoluminescence (PL) imaging detector allows measuring of an X-ray diffraction image with a dynamic range of ∼107 within the sub-micrometre spatial resolution. At the PETRA III facility, the diffraction pattern created behind a circular aperture with a diameter of 5μm irradiated by a beam with a photon energy of 500eV was recorded on a LiF crystal. In the diffraction pattern, the accumulated dose was varied from 1.7 × 105Jcm-3 in the central maximum to 2 × 10-2Jcm-3 in the 16th maximum of diffraction fringes. The period of the last fringe was measured with 0.8μm width. The PL response of the LiF crystal being used as a detector on the irradiation dose of 500eV photons was evaluated. For the particular model of laser-scanning confocal microscope Carl Zeiss LSM700, used for the readout of the PL signal, the calibration dependencies on the intensity of photopumping (excitation) radiation (λ = 488nm) and the gain have been obtained.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Keyword
- Color centers
- Diffraction patterns
- LiF detectors
Publication and Content Type
- art (subject category)
- ref (subject category)
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