Abstract
We find a quasi quadratic dispersion of the plasmon up to ℏω p = 28 eV atk=1.77 Å−1 with no levelling off contrary to other measurements. We usedk-scans at constant energy loss andE-scans at constant wave vector, which yield different dispersions of the plasmon peak maximum because of the finite halfwidth. The levelling off in plasmon dispersion observed previously is due to multiple scattering events, which obscure the plasmon dispersion inE-scans.
We confirmed the anisotropy of the dispersion coefficient α by investigating polycrystalline samples of different orientation.
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Eickmans, J., Möller, H. & Otto, A. Plasmon dispersion in Al atk≦k F using electron energy loss spectroscopy. Z. Physik B - Condensed Matter 46, 99–105 (1982). https://doi.org/10.1007/BF01312714
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DOI: https://doi.org/10.1007/BF01312714