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Optimizing Atom Probe Analysis with Synchronous Laser Pulsing and Voltage Pulsing.

Lu Zhao1, Antoine Normand1, Jonathan Houard1

  • 11INSA Rouen,UNIROUEN,CNRS,GPM,Normandie Université,76000 Rouen,France.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|February 9, 2017
PubMed
Summary

This study introduces a novel atom probe technique combining voltage and laser pulses for enhanced material analysis. Optimizing the pulse delay improves mass spectrum quality for atomic-scale 3D imaging.

Keywords:
atom probefield evaporationmass resolutionpump-probeshort HV pulse

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Physics

Background:

  • Atom probe tomography (APT) enables 3D material analysis at the atomic scale.
  • Conventional APT uses either high-voltage (HV) or laser pulses for field evaporation.
  • Improving mass resolution in APT often compromises spatial resolution.

Purpose of the Study:

  • To propose and validate a new atom probe setup utilizing simultaneous voltage and laser pulsing.
  • To enhance mass resolution in APT without sacrificing spatial resolution.
  • To investigate the effect of precise pulse delay control on spectrum quality.

Main Methods:

  • Development of a hybrid pulsing system combining HV and laser pulses.
  • Precise control of the time delay (femtosecond timescale) between voltage and laser pulses.
  • Experimental measurement of the HV pulse shape at the sample apex.
  • Construction of a home-made voltage pulse generator and an air-to-vacuum transmission system.

Main Results:

  • The combined pulsing method offers a straightforward approach to improve mass resolution.
  • Optimizing the delay between voltage and laser pulses demonstrably enhances mass spectrum quality.
  • The intrinsic spatial resolution of the atom probe instrument is maintained.

Conclusions:

  • Simultaneous voltage and laser pulsing is an effective strategy for advancing atom probe capabilities.
  • This technique provides a pathway to higher-fidelity atomic-scale 3D material characterization.
  • The optimized hybrid pulsing method shows significant promise for materials research.