Regensburg 2007 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 8: Charge Transfer
BP 8.4: Vortrag
Montag, 26. März 2007, 18:45–19:00, H44
Localization of electronic states of proteins probed by resonant photoemission — •Denis Vyalikh1, Volodymyr Maslyuk2, Andreas Kade1, Alexander Kirchner3, Anja Blüher3, Ingrid Mertig2, Michael Mertig3, and Serguei Molodtsov1 — 1Institut für Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany — 2Martin-Luther-Universität Halle-Wittenberg, Fachbereich Physik, D-06099 Halle, Germany — 3Max-Bergmann-Zentrum für Biomaterialien, Technische Universität Dresden, D-01062 Dresden, Germany
The electronic structure of the biological system - regular two-dimensional bacterial surface protein layer (S layer) of Bacillus sphaericus NCTC 9602 - was investigated by resonant photoemission (PE) spectroscopy at the C 1s, N 1s and O 1s absorption edges. Resonant PE spectra taken in the vicinity of the C 1s absorption threshold exhibit an enhancement of the valence-band emission, indicating rather localized character of the lowest laying unoccupied orbitals. We have established kinetic energy shifts of the O- and N- KVV Auger lines across excitations of primarily electrons into the corresponding π* resonances that can help to shed light on the electron transport properties in the extremely large biomolecules.