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Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

459
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
459

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Related Experiment Video

Updated: Nov 18, 2025

Implementation of a Hyperbolic Vortex Plasma Reactor for the Removal of Micropollutants in Water
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Persistent Sputtering Yield Reduction in Plasma-Infused Foams.

Gary Z Li1, Richard E Wirz1

  • 1Plasma & Space Propulsion Laboratory University of California, Los Angeles, California 90095, USA.

Physical Review Letters
|February 5, 2021
PubMed
Summary
This summary is machine-generated.

Aluminum microfoams show significantly reduced sputtering yields (40%-80%) compared to flat surfaces. This is due to plasma infusion into the foam structure, which enhances particle recapture, especially at lower ion energies.

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Area of Science:

  • Materials Science
  • Plasma Physics
  • Surface Engineering

Background:

  • Sputtering yield is crucial for plasma-based material processing.
  • Microstructured surfaces like foams can alter plasma-surface interactions.
  • Understanding sputtering behavior in complex geometries is essential for optimizing thin film deposition and etching.

Purpose of the Study:

  • To quantify the sputtering yield reduction of aluminum microfoams under argon plasma bombardment.
  • To develop an analytical model explaining the influence of foam geometry and plasma sheath on sputtering.
  • To differentiate sputtering regimes based on plasma infusion into the foam structure.

Main Methods:

  • Experimental measurement of sputtering yields for aluminum microfoams and flat aluminum surfaces.
  • Bombardment with 100 to 300 eV argon plasma.
  • Development and application of an analytical model considering foam geometry and plasma sheath thickness.

Main Results:

  • Aluminum microfoams exhibited 40%-80% lower sputtering yields than flat surfaces.
  • Sputtering yield strongly depends on foam geometry and plasma sheath characteristics.
  • Plasma infusion into pores larger than the sheath thickness leads to volumetric sputtering phenomena and significant yield reduction via geometric recapture.

Conclusions:

  • Microfoam geometry and plasma infusion fundamentally alter sputtering dynamics.
  • Geometric recapture of sputtered particles is a key mechanism for yield reduction in plasma-infused foams.
  • Lower ion energies enhance sputtering yield reduction in foams due to more effective particle recapture.