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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 40: POSTERS Electronic and Optical Properties

CPP 40.3: Poster

Donnerstag, 26. März 2009, 17:00–19:30, P3

Lowest ionization energies of transition metal ions in aqueous solutions investigated by photoelectron spectroscopy — •Robert Seidel¹, Manfred Faubel², Wolfgang Eberhardt¹, and Bernd Winter¹ — ¹Helmholtz Zentrum Berlin/BESSY II, Albert-Einstein-Strasse 15, 12489 Berlin, Germany — ²Max-Planck-Institut für Dynamik und Selbstorganisation, Bunsenstrasse 10, 37077 Göttingen, Germany

Hydration structure and electron energies of solvated ions are crucial for their reactivity in aqueous solutions. Here we report photoemission spectra from aqueous transition metal ions, which serve as homogeneous and heterogeneous catalysts. From the spectra the experimental vertical ionization energies of Ag⁺, Fe²⁺, Fe³⁺, and Cu²⁺ in water are obtained for the first time. The experiments were performed at the soft X-ray U41 PGM undulator beamline at BESSY II. A specially designed liquid microjet, providing a free liquid surface in vacuum, enables the detection of photoelectrons from the highly volatile solutions. A number of inorganic salt solutions are systematically investigated. One focus is on correlating measured electron binding energies, obtained for different counter ions and concentrations, with solvation shell structural details. Experimental binding energies are compared with theoretical calculations.