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Field ion spectroscopy of oscillating surface reactions: H2/O2 and H2/H2O on platinum

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Ernst,  Norbert
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Bozdech,  Georg
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Block,  Jochen H.
Fritz Haber Institute, Max Planck Society;

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Citation

Ernst, N., Bozdech, G., Gorodetskii, V., & Block, J. H. (1996). Field ion spectroscopy of oscillating surface reactions: H2/O2 and H2/H2O on platinum. International Journal of Mass Spectrometry and Ion Processes, 152(2-3), 185-191. doi:10.1016/0168-1176(95)04332-2.


Cite as: https://hdl.handle.net/21.11116/0000-0009-BA91-1
Abstract
Besides a smaller fraction of H2O+, the interaction of H2 and O2 with a platinum field ion emitter produces mainly H3O+ via a novel surface reaction-field desorption pathway:

Hads+H2Of-ads→H3Ogas++ePt-

For this reaction, the H3O+ field ion appearance energy is measured as 9.2 eV, almost 1.5 eV smaller than the value reported earlier for the H2O/Pt reaction system. The new protonation pathway is verified through mass-resolved and energy-resolved experiments on product ions of the oscillating H2/H2O/Pt and D2/H2O/Pt reaction systems. For H2/O2/Pt, the H2O+ appearance energy data suggest a partial transfer of reaction enthalpy to desorbing H2O molecules.