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Abstract
We present a combined experimental and theoretical work to obtain the energy loss function (ELF) or the excitation spectrum of samarium in the energy loss range between 3 and 200 eV. At low loss energies, the plasmon excitation is clearly identified and the surface and bulk contributions are distinguished. For the precise analysis the frequency-dependent energy loss function and the related optical constants (n and k) of samarium were extracted from the measured reflection electron energy loss spectroscopy (REELS) spectra by the reverse Monte Carlo method. The ps- and f-sum rules with final ELF fulfils the nominal values with 0.2% and 2.5% accuracy, respectively. It was found that a bulk mode locates at 14.2 eV with the peak width ~6 eV and the corresponding broaden surface plasmon mode locates at energies of 5-11 eV.
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Details
1 University of Science and Technology of China, Department of Physics, Hefei, People’s Republic of China (GRID:grid.59053.3a) (ISNI:0000000121679639)
2 China Academy of Engineering Physics, Institute of Materials, Jiangyou, People’s Republic of China (GRID:grid.249079.1) (ISNI:0000 0004 0369 4132)
3 ELKH, Centre for Energy Research, Research Institute for Technical Physics and Materials Science, Budapest, Hungary (GRID:grid.419116.a)
4 ELKH, Institute for Nuclear Research, Debrecen, Hungary (GRID:grid.418861.2) (ISNI:0000 0001 0674 7808)
5 University of Science and Technology of China, Department of Physics, Hefei, People’s Republic of China (GRID:grid.59053.3a) (ISNI:0000000121679639); University of Science and Technology of China, Hefei National Research Center for Physical Sciences at the Microscale, Hefei, People’s Republic of China (GRID:grid.59053.3a) (ISNI:0000000121679639)