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Updated: Feb 16, 2026

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Chromatic and spherical aberration correction with hexapole and quadrupole fields.

Shigeyuki Morishita1, Hidetaka Sawada2, Norihiro Okoshi2

  • 1JEOL Ltd., 3-1-2 Musashino, Akishima, Tokyo 196-8558, Japan; JEOL (U.K.) Limited, 1-2 Silver Court, Watchmead, Welwyn Garden City, Hertfordshire AL7 1LT, UK; Department of Materials, University of Oxford, Parks Road, Oxford, Oxfordshire OX1 3PH, UK; Rosalind Franklin Institute, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0QX, UK.

Ultramicroscopy
|February 14, 2026
PubMed
Summary

This study introduces a novel corrector for chromatic and spherical aberrations using hexapole and quadrupole fields. The new design enhances resolution, particularly when energy spread is a limiting factor in imaging.

Keywords:
Chromatic aberration correctionSpherical aberration correctionTransmission electron microscope

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Area of Science:

  • Physics
  • Optical Engineering
  • Electron Microscopy

Background:

  • Aberrations limit resolution in electron microscopy.
  • Chromatic and spherical aberrations are key challenges.
  • Existing correctors often require complex designs or multiple components.

Purpose of the Study:

  • To develop an advanced corrector for simultaneous chromatic and spherical aberration correction.
  • To improve imaging resolution in electron microscopy.
  • To offer a more integrated and efficient aberration correction solution.

Main Methods:

  • Utilized combinations of hexapole and quadrupole fields.
  • Employed thick hexapole fields for negative spherical aberration.
  • Integrated a quadrupole multiplet for negative chromatic aberration and transfer doublet function.

Main Results:

  • Successfully designed and implemented a corrector for simultaneous aberration correction.
  • Demonstrated significant resolution improvement in imaging.
  • Showcased effectiveness in cases limited by energy spread.

Conclusions:

  • The developed corrector effectively addresses both chromatic and spherical aberrations.
  • This design offers a viable alternative for enhancing electron microscope performance.
  • The integrated approach simplifies corrector design and improves imaging quality.