Can we control lifetimes of electronic states at surfaces by adsorbate 
resonances?

Hotzel, Arthur; Ishioka, Kunie; Knoesel, Ernst; Wolf, Martin; Ertl, Gerhard

doi:10.1016/S0009-2614(98)00054-2

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Can we control lifetimes of electronic states at surfaces by adsorbate resonances?

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Hotzel, Arthur
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Knoesel, Ernst
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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

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Ertl, Gerhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Hotzel, A., Ishioka, K., Knoesel, E., Wolf, M., & Ertl, G. (1998). Can we control lifetimes of electronic states at surfaces by adsorbate resonances? Chemical Physics Letters, 285(3-4), 271-277. doi:10.1016/S0009-2614(98)00054-2.

Cite as: https://hdl.handle.net/21.11116/0000-0006-D285-6

Abstract

Femtosecond time-resolved two-photon photoemission is used to study the excited electronic states of a Cu(111) surface covered with a monolayer of physisorbed O₂ on top of one to five Xe spacer layers. The spectra are dominated by a state 4.0 eV above E_F whose lifetime depends strongly on the number of Xe spacer layers. The lifetime decreases with increasing number of spacer layers from (650±30) fs for one Xe layer to (90±10) fs for five layers. To explain this trend we propose a model where the image potential states couple to a negative-ion resonance of the O₂ molecule.