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Related Experiment Videos

Optimisation of a scanning atom probe with improved mass resolution using post deceleration.

N Grennan-Heaven1, A Cerezo, T J Godfrey

  • 1Department of Materials, University of Oxford, Parks Road, Oxford OX1 3BH, UK. neil.grennan-heaven@materials.ox.ac.uk

Ultramicroscopy
|May 9, 2007
PubMed
Summary
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Improving ion mass resolution in scanning atom probe (SAP) analysis was achieved using post-deceleration techniques. This method enhanced data accuracy without requiring a reflectron lens, benefiting materials characterization.

Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Physics

Background:

  • Scanning Atom Probe (SAP) is a powerful surface-sensitive technique for 3D atomic-scale chemical analysis.
  • Achieving high mass resolution is crucial for accurate elemental and isotopic identification in SAP.
  • Existing methods for enhancing mass resolution often involve complex instrumentation, such as reflectron lenses.

Purpose of the Study:

  • To investigate the use of post-deceleration of ions in a scanning atom probe geometry to improve mass resolution.
  • To evaluate the impact of various electrode geometries, tip-to-electrode distances, and pulse shapes on mass resolution.
  • To compare experimental findings with simulations of ion trajectories.

Main Methods:

  • Experimental evaluation of different electrode configurations, tip-to-electrode distances (50-170 micrometers), and pulse shapes.

Related Experiment Videos

  • Utilizing post-deceleration of ions within the scanning atom probe setup.
  • 3D finite element electrostatics software for simulating ion trajectories and velocity variations.

    • Main Results:

    • Reproducible experimental mass resolutions of 750 FWHM and 200 FWTM were achieved for the 184W3+ peak.
    • Significant improvement in mass resolution was demonstrated without the need for a reflectron lens.
    • Simulated trends in ion velocities showed good agreement with experimental observations.

    Conclusions:

    • Post-deceleration in a scanning atom probe geometry is an effective strategy for enhancing mass resolution.
    • The study provides valuable insights into optimizing electrode design and operating parameters for improved SAP performance.
    • This approach offers a simpler and potentially more cost-effective way to achieve high mass resolution in atom probe tomography.