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Zusammenfassung:
We have used the techniques of electron loss spectroscopy (ELS) and inverse photoemission spectroscopy (IPES) to study the adsorption of Na on Al(111) as a function of coverage. We find a strong correlation between the energy of the primary loss feature in ELS and the unoccupied Na 3p level in IPES. This correlation allows us to interpret the ELS peak as an electronic transition for an Na coverage of less than one monolayer. For coverages greater than one Na layer, we observe an attenuation of the unoccupied 3p level and a conversion of the ELS feature into an electronic excitation (a surface or interfacial plasmon mode).
