Data di Pubblicazione:
1989
Citazione:
Studies of copper valence states with Cu L3 x-ray-absortion spectroscopy / M. Grioni, J.B. Goedkoop, R. Schoorl, F.M.F. de Groot, J.C. Fuggle, F. Schafers, E.E. Koch, G. Rossi, J.M. Esteva, R.C. Karnatak. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - 39:3(1989 Jan 15), pp. 1541-1545. [10.1103/PhysRevB.39.1541]
Abstract:
We have used x-ray-absorption spectroscopy to study a series of compounds in which Cu assumes a formal valence between 0 and 3. We find that the shape, the threshold energy, and the intensity of the Cu L3 absorption edge is strongly influenced by the chemical state of the Cu atoms. We use the Cu 2p x-ray-absorption spectra of a large number of Cu compounds, including sulfides, oxides, La-Sr-Cu-O compounds, a phthalocyanine complex, and various minerals to show that the presence of a strong 2p-3d excitonic transition is a fingerprint of the Cu(d9) contribution to the ground state. A simple ionic picture is generally inadequate to describe these compounds.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
M. Grioni, J.B. Goedkoop, R. Schoorl, F.M.F. de Groot, J.C. Fuggle, F. Schafers, E.E. Koch, G. Rossi, J.M. Esteva, R.C. Karnatak
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