Lifetime Effects of Xenon Adsorption on the Image-Potential States of Ru(0001)
The electron dynamics of the image-potential states of clean and Xe-covered Ru(0001) surfaces was investigated by means of time-resolved two-photon photoemission. Xe adsorption is observed to reduce the coupling of the first image-potential state to the metal and leads to lifetimes that increase from 11 fs in case of the clean surface to 125 fs for a bilayer of Xe. The results are discussed within the framework of a tunneling model wherein the Xe 6s-derived electron affinity level determines the barrier height.
KeywordsBarrier Height Temperature Program Desorption Lifetime Effect Temperature Program Desorption Spectrum Xenon Adsorption
Unable to display preview. Download preview PDF.
- 1.P. Feulner and D. Menzel in: Laser Spectroscopy and Photochemistry on Metal Sur-faces, H.-L. Dai and W. Ho (eds.),. (World Scientific, Singapore, 1995 ), pp. 627.Google Scholar
- 5.Th. Fauster and W. Steinmann in: Photonic Probes of Surfaces, P. Halevi (ed.), Electromagnetic Waves: Recent Developments in Research Vol. 2 (North-Holland, Amsterdam, 1995 ), pp. 347.Google Scholar