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.

Collective excitations of thin films of disordered potassium adsorbed on Ag(110)

ROCCA, MARIO AGOSTINO;
1999-01-01

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.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/388223
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? 5
social impact