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- W2094871330 abstract "We propose an ab initio method to evaluate the core-valence-valence Auger spectrum of systems with filled valence bands. The method is based on the Cini-Sawatzky theory and aims at estimating the parameters by first-principles calculations in the framework of density-functional theory (DFT). Photoemission energies and the interaction energy for the two holes in the final state are evaluated by performing DFT simulations for the system with varied population of electronic levels. Transition matrix elements are taken from atomic results. The approach takes into account the nonsphericity of the density of states of the emitting atom, spin-orbit interaction in core and valence, and nonquadratic terms in the total-energy expansion with respect to fractional occupation numbers. It is tested on two benchmark systems, Zn and Cu metals, leading in both cases to ${L}_{23}{M}_{45}{M}_{45}$ Auger peaks within 2 eV from the experimental ones. Detailed analysis is presented on the relative weight of the various contributions considered in our method, providing the basis for future development. Especially problematic is the evaluation of the hole-hole interaction for systems with broad valence bands: our method underestimates its value in Cu, while we obtain excellent results for this quantity in Zn." @default.
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- W2094871330 date "2008-11-18" @default.
- W2094871330 modified "2023-09-26" @default.
- W2094871330 title "<i>Ab initio</i>calculation of core-valence-valence Auger spectra in closed shell systems" @default.
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- W2094871330 doi "https://doi.org/10.1103/physrevb.78.205111" @default.
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