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Related Experiment Videos

Towards sub-0.5 A electron beams.

O L Krivanek1, P D Nellist, N Dellby

  • 1Nion Co., 1102 8th St, Kirkland, WA 98033, USA. krivanek@nion.com

Ultramicroscopy
|July 23, 2003
PubMed
Summary
This summary is machine-generated.

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Aberration correction in scanning transmission electron microscopes (STEM) now achieves sub-Ångstrom resolution. New corrector designs minimize fifth-order aberrations, enabling even finer electron probes for advanced materials research.

Area of Science:

  • Materials Science
  • Physics
  • Electron Microscopy

Background:

  • Aberration correction has advanced significantly in scanning transmission electron microscopy (STEM) over the past four years.
  • Current electron microscopes (100-120kV) achieve sub-Ångstrom resolution and enhanced probe currents.
  • Fifth-order spherical aberration (C(5)) and chromatic aberration (C(c)) are now the primary limitations to resolution.

Purpose of the Study:

  • To summarize advancements in aberration correction for STEM.
  • To introduce a novel corrector design for fifth-order aberrations.
  • To project future resolution capabilities with optimized STEM columns and new correctors.

Main Methods:

  • Review of factors enabling sub-Ångstrom resolution in 100-120kV STEM.

Related Experiment Videos

  • Description of a new quadrupole/octupole corrector design.
  • Analysis of the corrector's impact on fifth-order aberrations and chromatic aberration (C(c)).

    • Main Results:

    • STEM instruments now routinely achieve sub-Ångstrom resolution.
    • Probe current in atom-sized probes has increased tenfold.
    • The new corrector design effectively corrects fifth-order aberrations with minimal C(c) increase (<0.2mm).

    Conclusions:

    • Advanced aberration correction is a powerful research tool in electron microscopy.
    • The novel corrector design paves the way for routine sub-Ångstrom electron probes at 100kV.
    • Future developments promise sub-0.5Å probes at higher operating voltages.