Isotopic substitution evidence against the formation of (H3O+)ad from 
coadsorption of hydrogen and water on Cu(110)

Schott, Joachim; Lackey, Damian; Sass, Jürgen-Kurt

doi:10.1016/0039-6028(90)90058-G

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Isotopic substitution evidence against the formation of (H₃O⁺)_ad from coadsorption of hydrogen and water on Cu(110)

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Schott, Joachim
Fritz Haber Institute, Max Planck Society;

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Lackey, Damian
Fritz Haber Institute, Max Planck Society;

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Sass, Jürgen-Kurt
Fritz Haber Institute, Max Planck Society;

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引用

Schott, J., Lackey, D., & Sass, J.-K. (1990). Isotopic substitution evidence against the formation of (H₃O⁺)_ad from coadsorption of hydrogen and water on Cu(110). Surface Science, 238(1-3), L478-L480. doi:10.1016/0039-6028(90)90058-G.

引用: https://hdl.handle.net/21.11116/0000-0006-9BBB-9

要旨

We present both high resolution electron energy loss spectra (HREELS) and thermal desorption spectra (TDS) for hydrogen plus water coadsorption on Cu(110). Hydrogen adsorbed at 100 K. increases the desorption temperature of water by ∽ 10 K., indicating a fairly weak interaction. This stabilised water is associated with dramatic changes in the HREELS spectra: the scissor mode at 1600 cm⁻¹ is attenuated and a new vibration is observed at 1150 cm⁻¹. The assignment of this mode to the symmetric bend of an (H₃O⁺)_ad species as recently reported for Pt(111), therefore seemed plausible also for Cu(110). However, TDS showed <em>no isotopic exchange</em> which indicates that a reaction between (H)_ad and (H₂O)_ad does not occur on Cu(110). The different origin of the 1150 cm⁻¹ mode on Cu(110) is briefly discussed.