TY - JOUR
T1 - Emission of ionic water clusters from water ice films bombarded by energetic projectiles
AU - Wojciechowski, Igor A.
AU - Kutliev, Uchkun
AU - Sun, Shixin
AU - Szakal, Christopher
AU - Winograd, Nicholas
AU - Garrison, Barbara J.
N1 - Funding Information:
The work was supported by the National Science Foundation through the Chemistry Division and by the National Institute of Health. The computational support was provided by Academic Services and Emerging Technologies (ASET) group at Penn State University.
PY - 2004/6/15
Y1 - 2004/6/15
N2 - 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.
AB - 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.
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U2 - 10.1016/j.apsusc.2004.03.036
DO - 10.1016/j.apsusc.2004.03.036
M3 - Article
AN - SCOPUS:2942558761
SN - 0169-4332
VL - 231-232
SP - 72
EP - 77
JO - Applied Surface Science
JF - Applied Surface Science
ER -