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Surface-Induced dissociation from a liquid surface.

T Pradeep1, S A Miller, R G Cooks

  • 1Department of Chemistry, Purdue University, West Lafayette, Indiana, USA.

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|November 15, 2013
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Summary
This summary is machine-generated.

Liquid perfluorinated polyether (PFPE) surfaces efficiently transfer energy from colliding ions, similar to self-assembled monolayers. These PFPE surfaces exhibit stable ion-surface reactions and chemical sputtering without hydrocarbon contamination.

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Area of Science:

  • Surface science
  • Physical chemistry
  • Ion-surface interactions

Background:

  • Surface-induced dissociation (SID) is crucial for ion analysis.
  • Understanding energy transfer mechanisms in ion-surface collisions is key.
  • Perfluorinated polyether (PFPE) liquids offer unique surface properties for such studies.

Purpose of the Study:

  • To investigate the translational-to-vibrational (T-V) energy transfer efficiency of PFPE surfaces.
  • To characterize ion-surface reactions and chemical sputtering on PFPE surfaces.
  • To assess the suitability of PFPE surfaces for ion collision experiments.

Main Methods:

  • Mass-selected projectile ions (tens of eV) collided with a liquid PFPE surface.
  • A "thermometer" ion, W(CO)x+, was used to quantify T-V energy transfer.
  • Analysis of scattered ion products and sputtered fragments identified reaction pathways.

Main Results:

  • PFPE surfaces demonstrated T-V energy transfer efficiency comparable to fluorinated self-assembled monolayers (SAMs).
  • An average T-V conversion efficiency of 18% was measured for W(CO)x+ ions (30-50 eV).
  • Stable ion-surface reactions (e.g., WFm+, W(CO)nFm+) and chemical sputtering (CF3+, C2F5+, C3F7+, CFO+) were observed without hydrocarbon contamination.

Conclusions:

  • Liquid PFPE surfaces are effective for ion-surface energy transfer and reactions.
  • The PFPE surface chemistry allows F and CF3 group reactions, with oxygen atoms less accessible.
  • PFPE surfaces are robust and suitable for ion collision studies, offering a clean alternative to other surfaces.