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Atomic Force Microscopy01:08

Atomic Force Microscopy

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The AFM Probe
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Picometer-Precision Atomic Position Tracking through Electron Microscopy
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Optimal laser positioning for laser-assisted atom probe tomography.

S Koelling1, N Innocenti, J Bogdanowicz

  • 1Fraunhofer-CNT, Königsbrücker Str. 180, 01099 Dresden, Germany.

Ultramicroscopy
|April 13, 2013
PubMed
Summary

Optimizing laser spot placement in laser-assisted atom probe tomography (LA-APT) using simulations enhances mass resolution. Simulations accurately predict experimental results for improved material analysis.

Keywords:
Laser-assisted atom probeLaser-tip interactionSilicon

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Surface Science

Background:

  • Laser-assisted atom probe tomography (LA-APT) analyzes materials by field evaporating ions.
  • A combination of electric fields and laser pulses initiates ion evaporation for time-of-flight mass analysis.
  • Laser pulses deposit thermal energy, enabling temporary ion evaporation from the sample tip.

Purpose of the Study:

  • To determine the optimal laser spot position for maximizing mass resolution in LA-APT.
  • To utilize simulations of laser absorption on silicon tips to guide experimental parameters.
  • To validate simulation predictions by comparing them with experimental mass resolution data.

Main Methods:

  • Simulations of laser absorption on a silicon tip.
  • Time-of-flight mass spectrometry in LA-APT.
  • Experimental validation of simulation-derived optimal laser positions.

Main Results:

  • Simulations identified specific laser spot positions that maximize mass resolution.
  • Experimental results confirmed that mass resolution varied as predicted by the simulations.
  • The study establishes a correlation between laser absorption simulation and experimental LA-APT performance.

Conclusions:

  • Precise laser spot positioning is critical for achieving high mass resolution in LA-APT.
  • Simulation-based optimization is a valuable tool for enhancing LA-APT experimental outcomes.
  • This work contributes to the advancement of high-resolution material analysis techniques.