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The spectral dependences of the imaginary parts of the dielectric permittivity ε2(E), bulk (–Im ε–1) and surface (–Im (1 + ε)–1) characteristic electron energy losses for a barium selenide crystal are decomposed into 34 elementary bands in the 3–5.5 eV region at 2 K and in the 5.5–26 eV region at 77 K by an improved combined Argand diagram method. For each band in the three types of spectra, we determined...
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