Validity of Inelastic-Electron-Scattering Data in Determining the Metallic or Insulating Properties of Adsorbed Atomic Layers

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Abstract
It is pointed out that the observation of plasmon energy-loss peaks and determination of peak breadths in inelastic-electron-scattering experiments cannot be used to distinguish metallic or insulating materials. The recent claim, based on inelastic-electron-scattering data, by MacRae, Müller, Lander, Morrison, and Phillips that the initial (low-density) second layer of cesium adsorbed on a tungsten (100) surface is in an insulating state is considered not proved.

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