Calculations are reported of the electron band structure of a transition metal (technetium). The band structure is then used to find the imaginary and real parts of the long-wavelength macroscopic permittivity and also the loss function. The calculated loss function is compared with the experimental spectra of characteristic losses in Tc. The agreement between the energies of the main singularities in these spectra with those in the calculated curve is quite satisfactory. It is shown that the appearance of another plasma resonance (in addition to the line representing the collective oscillations of all seven valence electrons of Tc) in the experimental spectra is shown to be due to intense interband transitions from bands of the d type to bands with a strong p-f hybridization. The calculated results suggest that the low-intensity additional lines observed in the experimental characteristic loss spectra represent collective interband modes.
|Number of pages||3|
|Journal||Soviet Physics, Solid State (English translation of Fizika Tverdogo Tela)|
|Publication status||Published - 1 Nov 1984|
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