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Adsorption of O2 on Pd(110)

MPG-Autoren
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Goschnick,  A.
Fritz Haber Institute, Max Planck Society;

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Wolf,  Martin       
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Unertl,  W. N.
Fritz Haber Institute, Max Planck Society;

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Grunze,  M.
Fritz Haber Institute, Max Planck Society;

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

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Loboda-Cackovic,  J.
Fritz Haber Institute, Max Planck Society;

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Zitation

Goschnick, A., Wolf, M., Unertl, W. N., Grunze, M., Block, J. H., & Loboda-Cackovic, J. (1986). Adsorption of O2 on Pd(110). Surface Science, 178(1-3), 831-841. doi:10.1016/0039-6028(86)90358-4.


Zitierlink: https://hdl.handle.net/21.11116/0000-000E-AFDF-3
Zusammenfassung
We studied the adsorption of oxygen on Pd(110) in the temperature range from 100 to 600 K. The experimental apparatus used a video LEED system to monitor changes in surface crystallography and two mass spectrometers to study adsorption, desorption and reaction with CO. The sticking coefficient for dissociative oxygen adsorption is 0.86 ± 0.03 at T > 160 K. For T < 160 K molecular oxygen adsorption was observed. Atomic oxygen coverage measurements were performed by reaction of the oxygen with CO to form CO2. Up to a coverage of θ ≈ 0.23, we observed a LEED pattern previously identified as a (1 × 3) overlayer. However, our data rule out a simple adsorbate overlayer. The changes of the reciprocal lattice positions of the "13" spots as a function of oxygen coverage suggest an incommensurate structure with respect to the Pd(110) bulk periodicity. At θ > 0.23 a commensurate c(2 × 4) phase is formed and saturates at θ ≈ 0.48.