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Journal Article

Electronic properties of Cs1CO coadsorbed on the Ru„0001… surface

MPS-Authors
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Fichtner-Endruschat,  Sabine
Fritz Haber Institute, Max Planck Society;

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Renzi,  Valentina De
Fritz Haber Institute, Max Planck Society;

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Schwegmann,  Stefan
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Bludau,  Horst
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Schuster,  Rolf
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Over,  Herbert
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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1.475437.pdf
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Citation

Fichtner-Endruschat, S., Renzi, V. D., Morgante, A., Schwegmann, S., Bludau, H., Schuster, R., et al. (1998). Electronic properties of Cs1CO coadsorbed on the Ru„0001… surface. The Journal of Chemical Physics, 108(2), 774-779. doi:10.1063/1.475437.


Cite as: https://hdl.handle.net/21.11116/0000-0008-8723-8
Abstract
The variation of the Cs 6s and the Cs 5p emission in He* and Ne* metastable deexcitation spectroscopy (MDS) as a function of the CO exposure indicates a demetallization of the Ru(0001)–(2×2)-Cs and the Ru(0001)–(√3×√3)R30°-Cs surfaces upon CO coadsorption. This observation corroborates a (substrate-mediated) charge transfer from the Cs atom to the 2∏* orbital of CO. With the Ru(0001)–(2×2)-Cs system even at CO saturation, MD spectra show emission associated with the Cs 6s state, indicating that the Cs atoms are not completely ionized. Exposing the (√3×√3)R30°-Cs-pre-covered Ru(0001) to CO, surplus Cs of the first layer is displaced into a second layer. In this way, CO molecules are able to be accommodated into the first layer. Desorbing this second layer Cs by heating the sample to 600 K produces a (2×2) structure with one Cs and CO in the unit cell as evidenced by MDS and low energy electron diffraction.