Düsseldorf 2007 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 11: Biomolecules
MO 11.6: Vortrag
Montag, 19. März 2007, 15:15–15:30, 6B
X-ray photoelectron spectroscopy of amino acids in aqueous solution — •Dirk Nolting1, Manfred Faubel2, Ingolf-Volker Hertel1, and Bernd Winter1 — 1Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Berlin, Deutschland — 2Max-Planck-Institut für Dynamik und Selbstorganisation, Göttingen, Deutschland
The effect of solvation and protonation on the N 1s and C 1s core levels of amino acids was studied. For this a water beam was injected into a vacuum chamber and crossed with a synchrotron radiation beam. By varying the pH of the solution, different charge states could be addressed which made it possible to study protonation effects on nitrogen and adjacent carbons. Protonation caused a shift of 2 eV of N 1s to higher binding energies and a significantly smaller shift of 0.3 eV to adjacent carbon atoms.