Emission of ionic water clusters from water ice films bombarded by energetic projectiles

Igor A. Wojciechowski, Uchkun Kutliev, Shixin Sun, Christopher Szakal, Nicholas Winograd, Barbara J. Garrison

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Emission of water clusters M ± (H 2 O) n , where M ± denotes positive alkali metal ions, Li + , Na + , Cs + or negative halogen ions, Cl - , Br - , I - from ice films frozen on metal substrates bombarded by energetic particles was studied by a molecular dynamics (MD) technique and by ToF-secondary ion mass spectrometry (SIMS) experiments. In the experiment, different concentrations of the salts NaCl, NaBr, and NaI were dissolved in water before freezing. The influence of ion charge and concentration on ion signal was investigated. Due to the different solvation structures of cations and anions in water, cationic clusters were demonstrated to eject more effectively than anionic clusters in both the simulations and experiments. The dependence of the absolute ion yield on the salt concentration is discussed in terms of ion pairing and clustering in the original solution and during emission.

Original languageEnglish (US)
Pages (from-to)72-77
Number of pages6
JournalApplied Surface Science
Volume231-232
DOIs
StatePublished - Jun 15 2004

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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