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1 results

  • Expanding the Dimensions of a Small, Two-Dimensional Diffraction Detector

  • Xi Chen, Matthew R. Hauwiller, Abinash Kumar, Aubrey N. Penn, James M. LeBeau
  • Journal:
    Microscopy and Microanalysis / Volume 26 / Issue 5 / October 2020
    Published online by Cambridge University Press:
    11 August 2020, pp. 938-943
    Print publication:
    October 2020

  • We report an approach to expand the effective number of pixels available to small, two-dimensional electron detectors. To do so, we acquire subsections of a diffraction pattern that are then accurately stitched together in post-processing. Using an electron microscopy pixel array detector (EMPAD) that has only 128 × 128 pixels, we show that the field of view can be expanded while achieving high reciprocal-space sampling. Further, we highlight the need to properly account for the detector position (rotation) and the non-orthonormal diffraction shift axes to achieve an accurate reconstruction. Applying the method, we provide examples of spot and convergent beam diffraction patterns acquired with a pixelated detector.