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Atom Probe Tomography Analysis of Exsolved Mineral Phases
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Published on: October 25, 2019

Kinetic-energy discrimination for atom probe tomography.

Thomas F Kelly1

  • 1Cameca Instruments, Inc., formerly Imago Scientific Instruments Corporation, 5500 Nobel Drive, Madison, WI 53726, USA. thomas.kelly@ametek.com

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|January 21, 2011
PubMed
Summary

Adding kinetic-energy information significantly improves ion discrimination in atom probe tomography (APT). This enhancement helps resolve previously intractable interferences in time-of-flight (TOF) mass spectra, boosting data accuracy.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Spectroscopy

Background:

  • Atom probe tomography (APT) relies on time-of-flight (TOF) mass spectrometry for elemental analysis.
  • Ion peak interferences in TOF mass spectra can complicate accurate composition determination and 3D imaging.
  • Current APT methods lack direct kinetic energy measurements of ions.

Purpose of the Study:

  • To explore the benefits of incorporating kinetic-energy information into APT for ion discrimination.
  • To categorize ion peak interferences based on their resolvability using TOF and kinetic energy data.
  • To assess the potential impact of kinetic-energy resolving power (KRP) on APT performance.

Main Methods:

  • Categorization of ion peak interferences in time-of-flight mass spectra.
  • Analysis of discrimination capabilities using TOF data alone versus combined TOF and kinetic-energy data.
  • Illustration using real and simulated mass spectra.
  • Discussion of detector development prospects.

Main Results:

  • Kinetic-energy information can resolve ion peak interferences that are intractable with TOF data alone.
  • Modest kinetic-energy resolving powers (KRP ≈ 10) show significant impact on APT.
  • Higher KRP (≈ 100) can resolve energy deficits, enabling discrimination in straight-flight-path instruments.
  • Noise reduction in composition determination and 3D images is enabled by kinetic-energy discrimination.

Conclusions:

  • Kinetic-energy discrimination offers substantial benefits for improving ion identification accuracy in APT.
  • The findings are broadly applicable to time-of-flight spectroscopy.
  • Development of detectors capable of measuring ion kinetic energy is feasible and should be pursued.