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- W2078113189 abstract "The abstraction kinetics for atomic hydrogen (Hat) removal of chemisorbed D and atomic deuterium (Dat) removal of chemisorbed H are studied on single crystal Si surfaces. The surface H and D coverages are measured in real time by mass analyzing the recoiled H+ and D+ ion signals. On both Si(100) and Si(111) surfaces, the abstraction reactions are efficient, and have very low activation energies ≂0.5–1 kcal/mol. For abstraction from surfaces containing only monohydride species, the abstraction reaction probability is ≂0.36 times the adsorption rate of Hat or Dat. For the same Hat and Dat exposures, the reaction rates for Hat removal of adsorbed D and Dat removal of adsorbed H are nearly identical. All observations are consistent with a generalized Eley–Rideal abstraction mechanism, and a two-dimensional quantum-mechanical model is used to calculate reaction probabilities for these reactions. According to the model, the activation energies are due to enhanced abstraction rates from excited vibrational states of the adsorbed Si–H or Si–D bond. With SiH2 and SiH3 species present on the surface, the removal rate of H using Dat is decelerated, suggesting that the higher hydrides have a lower cross section for abstraction." @default.
- W2078113189 created "2016-06-24" @default.
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- W2078113189 date "1994-08-15" @default.
- W2078113189 modified "2023-09-23" @default.
- W2078113189 title "Atomic H abstraction of surface H on Si: An Eley–Rideal mechanism?" @default.
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- W2078113189 doi "https://doi.org/10.1063/1.467577" @default.
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