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Atomic Absorption Spectroscopy: Atomization Methods01:25

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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...
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Miniaturized gas exposure devices for atom probe experiments.

Benedict Ott1,2, Martina Heller1,2, Mehrpad Monajem1

  • 1Department of Materials Science & Engineering, Institute I: General Materials Properties, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.

Microscopy Research and Technique
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Summary
This summary is machine-generated.

New small devices allow atom probe tomography specimens to be exposed to hydrogen gas, simplifying atomic-scale hydrogen detection. These cost-effective setups avoid contamination and operate safely in standard labs.

Keywords:
atom probeatom probe tomographydeuteriumdeuterium gas charging

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Surface Science

Background:

  • Atom probe tomography (APT) is crucial for atomic-scale material analysis, particularly for detecting hydrogen.
  • Traditional hydrogen charging methods for APT specimens can be complex, requiring cryo-preparation or leading to electrolyte contamination.
  • Existing hydrogen charging systems are often large, expensive, and necessitate specialized safety measures.

Purpose of the Study:

  • To develop and validate small, cost-effective devices for hydrogen gas exposure of APT specimens.
  • To enable hydrogen charging in standard laboratory environments without extensive safety protocols.
  • To offer an alternative to electrochemical charging, preventing electrolyte contamination.

Main Methods:

  • Introduction of novel, compact gas exposure devices for APT specimens.
  • Utilizing minimal gas volumes for efficient hydrogen or other gas charging.
  • Experimental validation using deuterium charging of palladium (Pd) APT tips.

Main Results:

  • Demonstrated successful hydrogen (deuterium) charging of palladium specimens using the new devices.
  • The setups are affordable, built from readily available parts, and easy to assemble.
  • Operation is feasible in regular laboratory settings with minimal safety concerns.

Conclusions:

  • The developed small-scale devices provide an accessible and efficient method for hydrogen charging of APT specimens.
  • This advancement simplifies atomic-scale hydrogen analysis by reducing equipment cost and complexity.
  • The technique is validated and applicable for materials science research requiring precise hydrogen detection.