The nature and the energy dispersion of the collective excitations of two layers of K adsorbed at 200 K on Ni(111) have been studied by high-resolution electron-energy-loss spectroscopy. At small momentum transfer parallel to the surface, q(parallel to), the loss spectrum showed two collective modes: an intense feature close to 2.70 eV, attributed to the surface plasmon, and a broad peak at 3.40 eV, interpreted as the multipole surface plasmon. Contrary to theoretical prediction for two layers of K on Al(111), present results demonstrate that in the limit of small q(parallel to) the excitation of the surface plasmon for two K layers on Ni(111) is possible.

Collective excitations of two layers of K on Ni(111)

CHIARELLO, Gennaro;CUPOLILLO, Anna;CAPUTI, Lorenzo;
1997

Abstract

The nature and the energy dispersion of the collective excitations of two layers of K adsorbed at 200 K on Ni(111) have been studied by high-resolution electron-energy-loss spectroscopy. At small momentum transfer parallel to the surface, q(parallel to), the loss spectrum showed two collective modes: an intense feature close to 2.70 eV, attributed to the surface plasmon, and a broad peak at 3.40 eV, interpreted as the multipole surface plasmon. Contrary to theoretical prediction for two layers of K on Al(111), present results demonstrate that in the limit of small q(parallel to) the excitation of the surface plasmon for two K layers on Ni(111) is possible.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/125339
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