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EnglishCollective electronic excitations of disordered potassium adsorbed on Ag(110) have been studied by energy loss spectroscopy-low-energy electron diffraction (ELS-LEED) for overlayer thicknesses varying from 0.3 to 2.3 monolayers. We find that, in the long-wavelength limit, the argon surface plasmon energy shifts upwards with increasing potassium coverage, contrary to the expectation of classical dielectric theory, while its dispersion decreases. The potassium-induced loss, connected to the 3s to 3p interband transition, sets in above half a monolayer coverage, indicating a filling of the K(3s) state. Above one monolayer coverage collective potassium-induced modes are observed as well.
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| Titolo: | Collective excitations of thin films of disordered potassium adsorbed on Ag(110) |
| Autori: | |
| Data di pubblicazione: | 1999 |
| Rivista: | |
| Abstract: | Collective electronic excitations of disordered potassium adsorbed on Ag(110) have been studied by energy loss spectroscopy-low-energy electron diffraction (ELS-LEED) for overlayer thicknesses varying from 0.3 to 2.3 monolayers. We find that, in the long-wavelength limit, the argon surface plasmon energy shifts upwards with increasing potassium coverage, contrary to the expectation of classical dielectric theory, while its dispersion decreases. The potassium-induced loss, connected to the 3s to 3p interband transition, sets in above half a monolayer coverage, indicating a filling of the K(3s) state. Above one monolayer coverage collective potassium-induced modes are observed as well. |
| Handle: | http://hdl.handle.net/11567/388223 |
| Appare nelle tipologie: | 01.01 - Articolo su rivista |
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