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Transmission Electron Microscopy01:15

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A Method for Obtaining Serial Ultrathin Sections of Microorganisms in Transmission Electron Microscopy
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Published on: January 17, 2018

An accurate multislice method for low-energy transmission electron microscopy.

Canying Cai1, Jianghua Chen

  • 1Center for High-Resolution Electron Microscopy, College of Materials Science & Engineering, Hunan University, Changsha 410082, China.

Micron (Oxford, England : 1993)
|November 18, 2011
PubMed
Summary

For low-energy transmission electron microscopy (LE-TEM), the conventional multislice method (CMS) is inaccurate. The revised real space (RRS) method offers a more accurate alternative for LE-TEM simulations.

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Area of Science:

  • Materials Science
  • Physics
  • Computational Science

Background:

  • The conventional multislice method (CMS) is a standard algorithm for transmission electron microscopy (TEM) image and diffraction calculations.
  • CMS relies on the high-energy approximation, neglecting a differential term for computational efficiency.
  • This approximation can introduce significant errors in low-energy transmission electron microscopy (LE-TEM).

Purpose of the Study:

  • To evaluate the accuracy of CMS in LE-TEM (<100 kV).
  • To introduce and validate the revised real space (RRS) method as an accurate alternative for LE-TEM.
  • To compare the numerical performance of RRS and CMS under various conditions.

Main Methods:

  • Implementation of the accurate multislice method (revised real space method - RRS).
  • Numerical comparison of RRS and CMS simulations.
  • Analysis of results based on varying accelerating voltages, Debye-Waller factors, and beam tilts.

Main Results:

  • The high-energy approximation in CMS leads to substantial errors in LE-TEM simulations.
  • The RRS method provides more accurate calculations for LE-TEM image and diffraction simulations.
  • RRS demonstrates comparable computational efficiency to CMS for LE-TEM applications.

Conclusions:

  • CMS is not sufficiently accurate for LE-TEM (<100 kV) image and diffraction simulations.
  • The RRS method is a viable and accurate alternative for LE-TEM, offering improved precision.
  • RRS enables more reliable simulations in LE-TEM without prohibitive computational costs.