Multiquantum scattering processes and transmission electron energy loss spectra
State University of Moldova, Department of Physics, 2009 Kishinau, Moldova, Republic of
Corresponding author: a firstname.lastname@example.org
Revised: 27 October 2006
Published online: 13 January 2007
Microscopic many-body theory for electronic properties of solid states is developed with an emphasis on the role of correlation memory effects. Heisenberg equation of motion, fluctuation-dissipation theorem and operators of commutation have been used to calculate multiplasmon transmission electron energy loss spectra. Multiquantum integral kinetic equation for the longitudinal complex dielectric function is derived. Strong interaction between high-energy probe beam electrons penetrating the solid state and plasma of valence electrons is taken into account. It is shown that average number of high-frequency plasmons generated in every collision process is more than one for typical values of metal parameters. It is obtained that excitation of a good few plasmons is simultaneous event. Calculated multiplasmon structure of electron energy loss spectra coincides with experimental.
PACS: 71.10.-w – Theories and models of many-electron systems / 73.22.Lp – Collective excitations / 79.20.Uv – Electron energy loss spectroscopy
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2007