Dresden 2006 – wissenschaftliches Programm
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MM: Metall- und Materialphysik
MM 25: Poster Session
MM 25.37: Poster
Mittwoch, 29. März 2006, 15:30–17:30, P4
Core hole effects in the O K absorption edge spectra of MgO, Al2O3 and ZnO — •T. Haupricht1, R. Sutarto1, H. Ott1, H. Wu1, H. -H Hsieh2, H. -J Lin3, C. T. Chen3, and L. H. Tjeng1 — 1II. Physikalisches Institut, Universität zu Köln — 2Chung Cheng Institute of Technology, National Defense University, Taoyuan 335, Taiwan — 3National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30077, Taiwan
One of the main challenges in theoretical solid state physics is to calculate accurately the response of a system to an external perturbation. This not a trivial task, not even for materials considered to be simple: band-insulators. Recently, several sophisticated methods have been developed to calculate the soft x-ray absorption spectra [1]. To test the accuracy of such calculation is also not trivial because not much reliable experimental data is available. For this we set out to do O K x-ray absorption measurement on standard materials like MgO, Al2O3 and ZnO. To obtain reliable data, i.e. not distorted by saturation effects, we have collected the spectra in the total electron yield mode, thereby taking also care that charging effects are neutralized. These experimental spectra are compared to the results of various theoretical approaches.
[1] Eric. L Shirley, Phys. Rev. B 80 (1998) 794