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Phys. Rev. B 80, 155433 (2009) [8 pages]

Oscillator strength of the peptide bond π∗ resonances at all relevant x-ray absorption edges

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K. Kummer1, V. N. Sivkov2, D. V. Vyalikh1, V. V. Maslyuk3, A. Blüher4, S. V. Nekipelov2, T. Bredow5, I. Mertig3, M. Mertig4, and S. L. Molodtsov1
1Institut für Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany
2Komi Science Center, Russian Academy of Science, Ural Division, Syktyvkar 167982, Russia
3Martin-Luther-Universität Halle-Wittenberg, Fachbereich Physik, D-06099 Halle, Germany
4Max-Bergmann-Zentrum für Biomaterialien und Institut für Werkstoffwissenschaft, Technische Universität Dresden, D-01062 Dresden, Germany
5Institut für Physikalische und Theoretische Chemie, Universität Bonn, D-53115 Bonn, Germany

Received 18 August 2009; revised 15 September 2009; published 15 October 2009

Absolute x-ray absorption cross sections of a regular bacterial surface-layer protein deposited on a naturally oxidized silicon substrate were determined experimentally. Upon separation of the partial cross sections of the three relevant 1s absorption edges, the oscillator strengths of the 1s→π∗ excitations within the peptide-backbone unit were extracted. Comparison with results of first-principles calculations revealed their close correlation to the topology of πpeptide∗ orbitals of the peptide backbone.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.155433
DOI:
10.1103/PhysRevB.80.155433
PACS:
33.20.Rm, 33.80.Eh, 33.70.−w
 
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