Joint experimental and computational study of aluminum electron energy loss spectra |
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Authors: | Lucia Calliari Massimiliano Filippi |
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Institution: | a ITC-irst, Via Sommarive 18, I-38050 Povo, Trento, Italy b Dipartimento di Fisica dell’Università di Trento, Via Sommarive 18, I-38050 Povo, Trento, Italy |
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Abstract: | Experimental reflection electron energy loss (REEL) spectra are measured from aluminum for primary energies ranging from 130 eV to 2 keV. A Monte Carlo simulation is shortly described and used to calculate the same spectra. The focus is on reproducing the variable weight of surface and bulk losses as the surface sensitivity of spectra changes by changing the primary electron energy. The intensity of surface losses in the simulations is modulated by the thickness of the region where surface excitations occur. Simulations based either on a constant or an energy-dependent thickness for this layer are considered. In both cases, simulated spectra reproduce the experimental trend as a function of energy, though the correct surface-to-bulk intensity ratio for each energy is either underestimated or overestimated. |
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Keywords: | Aluminum Reflection electron energy loss spectroscopy Monte Carlo simulation Impact phenomena Plasmons Surface excitations |
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