Dresden 2006 – wissenschaftliches Programm
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DS: Dünne Schichten
DS 10: Thin organic films I
DS 10.3: Vortrag
Dienstag, 28. März 2006, 10:00–10:15, GER 38
XANES and resonant Auger measurements of benzo-annelated Copper Porphyrazine molecules — •D. R. Batchelor1, D. Pop2, A. Schöll 1, S. Kera 3, B. Winter 2, W. Freyer 2, and E. Umbach1 — 1Exp.Physik II, Univ. Würzburg — 2MBI für Nichtlineare Optik und Kurzzeitspektroskopie, Berlin — 3Faculty of Engineering, Chiba University, Japan
High resolution x-ray absorption spectra from a family of linear benzo-annelated copper porphyrazine molecules have been measured at the nitrogen K and copper L2,3 edges in an effort to understand the charge transfer between the central copper atom and the conjugated ring of nitrogen atoms. The spectra are very distinctive showing a clear trend in energy structure and an energy shift of the main π* resonances. Calculations using the STOBE code for both edges are able to reproduce the structure and shift well. Auger resonance experiments for copper phthalocyanine exhibit a large spectator shift and show that the main π* resonance contains appreciable, if not dominating, orbital excitations besides those simply involving the LUMO. This is contrary to the normal interpretation of XANES data and demonstrates the complex nature of the excitation and at the same time the wealth of information obtainable in such experiments.
Funded by BMBF under contract no. 05KS4WWC/2