High-intensity transition in the low-energy part of the electron-energy-loss spectra of Yb and related metals

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Abstract
The origin of a high-intensity transition positioned in the low-energy region of the electron-energy-loss spectra of Yb and related metals is discussed. Considering the systematics in the 4f series, the behavior of the real part of the dielectric function, band calculations, gas-phase data, and the variation in the intensity of the energy loss as a function of primary electron-beam energy, we deduce that the strong excitation originates from an interband transition involving single-particle excitations of valence electrons.