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Surface sensitivity in cluster-ion-induced sputtering.

Christopher Szakal1, Joseph Kozole, Michael F Russo

  • 1Department of Chemistry, Penn State University, 104 Chemistry Building, University Park, Pennsylvania 16802, USA.

Physical Review Letters
|June 29, 2006
PubMed
Summary
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This study investigates how ion beams remove water ice from silver surfaces. Thicker ice layers lead to reduced silver ion sputtering, with ejection mechanisms clarified by simulations.

Area of Science:

  • Materials Science
  • Surface Science
  • Physics

Background:

  • Ion beam sputtering is crucial for surface analysis.
  • Understanding projectile-ion interactions with ice overlayers is key for techniques like secondary ion mass spectrometry (SIMS).

Purpose of the Study:

  • To investigate the ion beam-induced removal of thin water ice films from silver surfaces.
  • To determine the relationship between ice thickness and silver ion sputtering yields.
  • To elucidate the ejection mechanism of silver ions through water ice overlayers.

Main Methods:

  • Experimental analysis of ion beam sputtering using energetic Au, Au2, Au3, and C60 projectiles on silver with varying water ice thicknesses.
  • Molecular dynamics computer simulations to model the ejection process.

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Main Results:

  • Sputtered silver ion yields decrease exponentially with increasing water ice thickness (>10 Å).
  • Characteristic decay lengths (24, 20, 18, and 7.0 Å) were observed for different projectiles, correlating with projectile energy loss depths.
  • Simulations revealed that ejected silver atoms escape unimpeded due to the sweeping away of water molecules.

Conclusions:

  • The observed decay lengths reflect projectile energy deposition depths, not silver atom escape depths.
  • The mechanism involves the displacement of water molecules, facilitating silver ion ejection.
  • Findings are relevant for enhancing surface sensitivity in secondary ion mass spectrometry.