Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 20: Atomic Clusters III (with MO)

A 20.1: Hauptvortrag

Donnerstag, 11. März 2010, 14:00–14:30, F 303

The hydrated electron studied by fs-photoelectron spectroscopy — •Andrea Lübcke, Franziska Buchner, Nadja Heine, Thomas Schultz, and Ingolf Volkmar Hertel — Max-Born-Insitut, Max-Born-Strasse 2A, 12489 Berlin

Despite decades of intensive research, the nature of the hydrated electron (including its dynamic) is still controversially discussed. We use fs-photoelectron spectroscopy of a liquid jet of aqueous NaI solution to gain new insight into this matter. The solvated electron is generated by photodetachment from the iodide anion with UV laser pulses (6.20 eV) via a charge transfer to solvent process. A delayed laser pulse (4.65 eV) is used to probe the evolution of this electron.

For the first time we measured fs-photoelectron spectra of the solvated electron. We observe a quasi-instantaneous increase of the electron signal followed by a rapid shift of the spectrum caused by solvation of the electron. The signal decays on timescales of several hundred ps to ns due to recombination and/or diffusion. The binding energy of the solvated electron in a 100 mmol NaI solution is determined to be 3.3 eV.