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Image registration of low signal-to-noise cryo-STEM data

Journal Article · · Ultramicroscopy
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [1];  [1];  [3];  [4];  [4];  [4];  [5];  [1];  [2];  [6];  [1]
  1. Cornell Univ., Ithaca, NY (United States)
  2. The Johns Hopkins Univ., Baltimore, MD (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States); Harvard Univ., Cambridge, MA (United States)
  4. Rutgers Univ., Piscataway, NJ (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Cornell Univ., Ithaca, NY (United States); Univ. of Michigan, Ann Arbor, MI (United States)
Combining multiple fast image acquisitions to mitigate scan noise and drift artifacts has proven essential for picometer precision, quantitative analysis of atomic resolution scanning transmission electron microscopy (STEM) data. For very low signal-to-noise ratio (SNR) image stacks – frequently required for undistorted imaging at liq- uid nitrogen temperatures – image registration is particularly delicate, and standard approaches may either fail, or produce subtly specious reconstructed lattice images. We present an approach which effectively registers and averages image stacks which are challenging due to their low-SNR and propensity for unit cell misalignments. Registering all possible image pairs in a multi-image stack leads to significant information surplus. In combination with a simple physical picture of stage drift, this enables identi cation of incorrect image registrations, and determination of the optimal image shifts from the complete set of relative shifts. Here, we demonstrate the effectiveness of our approach on experimental, cryogenic STEM datasets, highlighting subtle artifacts endemic to low-SNR lattice images and how they can be avoided. High-SNR average images with information transfer out to 0.72 Å are achieved at 300 kV and with the sample cooled to near liquid nitrogen temperature.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
Air Force Research Laboratory (AFRL), Air Force Office of Scientific Research (AFOSR); Gordon and Betty Moore Foundation; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1479486
Alternate ID(s):
OSTI ID: 1703388
OSTI ID: 22807867
Journal Information:
Ultramicroscopy, Journal Name: Ultramicroscopy Journal Issue: C Vol. 191; ISSN 0304-3991
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Building and exploring libraries of atomic defects in graphene: Scanning transmission electron and scanning tunneling microscopy study journal September 2019
Emerging Electron Microscopy Techniques for Probing Functional Interfaces in Energy Materials journal October 2019
Emerging Electron Microscopy Techniques for Probing Functional Interfaces in Energy Materials journal January 2020
Atomic-resolution in-situ cooling study of oxygen vacancy ordering in La 0.5 Sr 0.5 CoO 3−δ thin films journal June 2019

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