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• 17:10, 12 February 2025 Tal talk contribs created page Bethe-Salpeter equation for core excitations (Created page with "VASP offers two approaches for calculating the X-ray Absorption Near Edge Structure ([https://en.wikipedia.org/wiki/X-ray_absorption_near_edge_structure XANES]). The supercell core-hole (SCH) method and the Bethe-Salpeter equation (BSE). Within the BSE approach, the two-particle polarizability <math>L(\mathbf{r}_1,\mathbf{r}_2,\mathbf{r}_3,\mathbf{r}_4,\omega)</math> is found by solving the equation ::<math>\bar{L}(\omega)=L_0(\omega)+L_0(\omega)(\bar{v}-W...")