Probe and object function reconstruction in incoherent stem imaging

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Description

Using the phase-object approximation it is shown how an annular dark- field (ADF) detector in a scanning transmission electron microscope (STEM) leads to an image which can be described by an incoherent model. The point spread function is found to be simply the illuminating probe intensity. An important consequence of this is that there is no phase problem in the imaging process, which allows various image processing methods to be applied directly to the image intensity data. Using an image of a GaAs<110>, the probe intensity profile is reconstructed, confirming the existence of a 1.3 {Angstrom} probe in a 300kV ... continued below

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27 p.

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Nellist, P.D. & Pennycook, S.J. September 1, 1996.

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Description

Using the phase-object approximation it is shown how an annular dark- field (ADF) detector in a scanning transmission electron microscope (STEM) leads to an image which can be described by an incoherent model. The point spread function is found to be simply the illuminating probe intensity. An important consequence of this is that there is no phase problem in the imaging process, which allows various image processing methods to be applied directly to the image intensity data. Using an image of a GaAs<110>, the probe intensity profile is reconstructed, confirming the existence of a 1.3 {Angstrom} probe in a 300kV STEM. It is shown that simply deconvolving this reconstructed probe from the image data does not improve its interpretability because the dominant effects of the imaging process arise simply from the restricted resolution of the microscope. However, use of the reconstructed probe in a maximum entropy reconstruction is demonstrated, which allows information beyond the resolution limit to be restored and does allow improved image interpretation.

Physical Description

27 p.

Notes

OSTI as TI96013793

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  • 15. Pfefferkorn conference on electron image and signal processing, Silver Bay, NY (United States), 18-22 May 1996

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  • Other: TI96013793
  • Report No.: CONF-9605207--1
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/367250 | External Link
  • Office of Scientific & Technical Information Report Number: 367250
  • Archival Resource Key: ark:/67531/metadc680509

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  • September 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Jan. 20, 2016, 12:10 p.m.

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Nellist, P.D. & Pennycook, S.J. Probe and object function reconstruction in incoherent stem imaging, report, September 1, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc680509/: accessed August 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.