Journal
PHYSICAL REVIEW B
Volume 63, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.63.085105
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Copper tetraazaporphyrin is used as a model for copper phthalocyanine in theoretical simulations of the features observed at the Cu L-2,L-3 near-edge x-ray absorption spectra. Theoretical results obtained by a density-functional theory approach provided interpretations of the different features observed experimentally, including the so-called white line and the satellite structures, leading to the conclusion that the solid phase arrangement exerts no significant influence on the shape of the Cu L-2,L-3 copper molecular spectrum. The calculations show that the unoccupied 3d levels are essentially located in the plane (3d(x2y2)) of the molecule with a small contribution that has an out-of-plane 3d(z2-y2) and 3d(xz,yz) character. The angular dependence of the copper unoccupied electronic levels could be used to confirm the orientation of the copper tetraazaporphyrin on the substrates.
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