Optical properties of alkali-earth atoms and Na-2 calculated by GW and Bethe-Salpeter equations
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Starting from the GW approximation (GWA) beyond density functional theory and solving the eigenvalue problem associated with the Bethe-Salpeter equation which accounts for the excitonic effect, I have determined optical properties of isolated Be, Mg and Ca atoms and Na-2. In the representation of single electron wave functions, I have used the all-electron mixed basis approach in which both plane waves and atomic orbitals are used as a basis set. The resulting quasiparticle energies and optical absorption spectra are compared with available experimental data. (C) 2004 Elsevier Ltd. All rights reserved.
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