Frankfurt 2006 – wissenschaftliches Programm

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MO: Molekülphysik

MO 27: Poster: Femtosecond Spectroscopy

MO 27.10: Poster

Dienstag, 14. März 2006, 16:30–18:30, Labsaal

Considerations for the measurement of the ultrafast heterogeneous electron transfer at metal oxide surfaces using two-photon photoelectron spectroscopy — •Jodi Szarko, Charaf Cherkouk, Lars Gundlach, Liana Socaciu-Siebert, Antje Neubauer, Ralph Ernstorfer, Rainer Eichberger, Guido Morbach, and Frank Willig — Hahn-Meitner-Institute, Dept. SE4, Glienicker Str. 100, 14109 Berlin, Germany

The photoinduced electron transfer from organic chromophores into metal oxide surfaces was investigated in our group using time-resolved two-photon photoelectron spectroscopy (2-PPE). A two-color pump-probe technique was made possible by utilizing two nonlinear optical parametric amplifiers (NOPAs) operating at 150 kHz. X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS) were also used to characterize the systems. The bare surfaces of the metal oxide crystals were first investigated to determine the best preparation procedure for the optimal surface cleanliness, stoichiometry, and work function for each crystal. The chromophores were then chemically anchored to the surfaces using a wet chemistry technique under inert gas conditions. Finally, the electron injection and transport were determined for the chromophore/metal oxide interfaces.