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• W2000708214 abstract "We report on the transmission of F+ and F− ions through ultrathin films of condensed water at 20 K, and compare the experimental results with theoretical calculations. The F+ and F− ions are produced by ESD (electron stimulated desorption) of a PF3 monolayer adsorbed on a Ru(0001) surface (PF3/Ru(0001) surface). We find two surprising results: (a) the off-normal F+ signal is attenuated to ∼1% by only ∼2.5 monolayer (ML) of H2O, while a much thicker layer, ∼10 ML of H2O, is necessary for equivalent attenuation of the F− ion emission, and (b) 1 ML of H2O increases the emission of F− ions and causes a dramatic change in the ion angular distribution. The striking changes in the angular distribution of F− ions transmitted through condensed H2O films indicate that elastic scattering is an important process in determining the attenuation of F− by H2O. No direct evidence for any kind of ion–molecule chemical reaction or collision induced dissociation reaction has been found. The strong attenuation of F+ without substantial changes in angular distribution suggests that charge transfer processes are important in limiting the transmission of F+ ions. Our quantum mechanical calculations indicate that the increase in F− emission upon adsorption of⩽1 ML of H2O is mainly due to a decrease in the neutralization probability of F− with the substrate, by a dielectric screening mechanism. The calculations also show that the increase in the F− survival probability saturates after a water bilayer (1 ML H2O) is formed, which is in excellent agreement with the experiment. Our measurements show no evidence for diffusion of H2O on the PF3/Ru(0001) surface between 20 and 60 K; the lack of diffusion, together with exponential attenuation of F+ and F− with H2O thickness, indicates that H2O vapor condensed on the PF3/Ru(0001) surface at 20 K grows statistically." @default.
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• W2000708214 date "1997-02-15" @default.
• W2000708214 modified "2023-10-08" @default.
• W2000708214 title "Low energy (&lt;5 eV) F+ and F− ion transmission through condensed layers of water" @default.
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• W2000708214 doi "https://doi.org/10.1063/1.473792" @default.
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