Abstract
The linearly polarized Cu L3-edge X-ray absorption near edge structure (XANES) of a La2CuO4 single crystal has been measured and the spectrum is interpreted by the full multiple scattering approach in the real space. The polarized XANES spectra over a range of 20 eV can be predicted in term of a one-electron dipole (δl = +1) transitions Cu 2p→ϵd, probing the unoccupied d-like (l=2) density of states of the high energy conduction bands. The white line is shown to be due to Cu 2p→3d transitions giving a bound final state Cu 2p53d10 formed by the 5.5 eV Coulomb interaction between the core hole and the 3d electron. The probability of ml=2 orbital angular momentum for the localized Cu 3d hole is shown to be in the range 95–100%.
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