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1 results

  • Ad Hoc Auto-Tuning of Aberrations Using High-Resolution STEM Images by Autocorrelation Function

  • Hidetaka Sawada, Masashi Watanabe, Izuru Chiyo
  • Journal:
    Microscopy and Microanalysis / Volume 18 / Issue 4 / August 2012
    Published online by Cambridge University Press:
    31 July 2012, pp. 705-710
    Print publication:
    August 2012

  • A method for measurement of the aberration status from high-resolution dark-field images is developed using scanning transmission electron microscopy (STEM), called the Segmented Image Autocorrelation function Matrix (SIAM). The method employs an autocorrelation function from the segmented area in the defocused STEM images from an aligned crystalline specimen to measure the defocus and twofold astigmatism for the probe-forming system. The values measured using this method can be fed directly back to the instrument by changing the strength of the stigmator and the objective lens of the microscope. It is successfully demonstrated that the feedback system can automatically correct the defocus and twofold astigmatism of the microscope after several iterations using practical STEM images from an actual crystalline specimen.