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Improving Spatial and Elemental Associations in Analytical Field Ion Microscopy.

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This study enhances analytical field ion microscopy (aFIM) for precise material analysis. New algorithms significantly improve signal-to-background, enabling clear identification of individual isotopes and elements at the atomic level.

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analytical field ion microscopyatom probe tomographyatomic resolutioncorrelation filteringtime-of-flight spectrometry

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Area of Science:

  • Materials Science
  • Surface Science
  • Analytical Chemistry

Background:

  • Chemically resolved atomic resolution imaging is crucial for understanding material properties but remains a significant challenge.
  • Existing techniques often struggle with high background noise, limiting their analytical capabilities.
  • Analytical Field Ion Microscopy (aFIM) aims to combine atomic resolution with chemical sensitivity.

Purpose of the Study:

  • To improve the performance of analytical Field Ion Microscopy (aFIM) by reducing background noise.
  • To develop and implement advanced algorithms for enhanced signal-to-background ratio in aFIM.
  • To demonstrate the capability of the improved aFIM for elemental identification at the atomic scale.

Main Methods:

  • Implementation of bespoke flight path time-of-flight corrections, normalized by electrostatic simulations specific to atom probe chambers.
  • Development of algorithms for filtering spatially and temporally correlated multiple ion events.
  • Application of these methods to analyze pure tungsten and a Cobalt-Tantalum-Boron (CoTaB) amorphous film.

Main Results:

  • Significant improvement in the signal-to-background ratio by three orders of magnitude in the mass spectrum of pure tungsten.
  • Successful distinction and identification of individual tungsten isotopes.
  • Demonstration of aFIM's applicability to complex materials beyond pure metals, including amorphous alloys like CoTaB.

Conclusions:

  • The developed algorithms effectively reduce background noise and enhance the signal-to-background ratio in aFIM.
  • This advancement enables precise elemental identification of surface atoms imaged by FIM, increasing reliability.
  • The improved aFIM technique offers a more powerful tool for atomic-resolution chemical analysis of diverse materials.