Stuttgart 2012 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 21: Poster 3: Cluster, Collisions, Energy Transfer, Photochemistry, Spectroscopy in He-Droplets

MO 21.22: Poster

Donnerstag, 15. März 2012, 16:30–19:00, Poster.IV

Solvated electrons at the water - vacuum interface — Franziska Buchner, Hans-Hermann Ritze, Thomas Schultz, and •Andrea Lübcke — Max-Born Institut Berlin

Solvated electrons play an important role in solution chemistry and have been extensively studied by means of transient absorption. As solvated electrons are very reagent, their behaviour at interfaces is of special interest. We use time-resolved liquid jet photoelectron spectroscopy (TRPES) at low kinetic energies to explore the energetics and dynamics of solvated electrons at the liquid surface. First, we will show, that contrary to previous assumptions, TRPES is surface sensitive. Then we will discuss the solvated electron energetics and dynamics in different environments and for different generation processes. E. g. the excitation of an alkali halide aqueous solution with sub-20 fs, 160 nm pulses leads to the formation of a solvated electron above the liquid surface which is stabilized by the cation. Its binding energy is about 2.5 eV and its lifetime is about 300 fs.