Regensburg 2004 – wissenschaftliches Programm

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O: Oberflächenphysik

O 28: Postersitzung (Elektronische Struktur, Grenzfläche fest-flüssig, Halbleiteroberflächen und -grenzflächen, Magnetismus und Symposium SYXM, Methodisches, Nanostrukturen, Oberflächenreaktionen, Teilchen und Cluster, Zeitaufgelöste Spektroskopie)

O 28.53: Poster

Mittwoch, 10. März 2004, 16:00–19:00, Bereich C

Lifetime of particle plasmon excitation in Ag-Nanoparticles — •Daniela Bayer, Alexander Mönnich, Jörg Lange, Michael Bauer, and Martin Aeschlimann — Dep. of Physics, University of Kaiserslautern

The dynamics of photoexcited hot electrons are of special interest for a large variety of modern fields such as fs-photochemistry and (magneto)electronics. These specific applications depend critically on the inelastic lifetime T1 of these hot electrons. Hence, the question arises if it would be possible to manipulate T1 in a specific way. In this poster, we will demonstrate that the specific structuring of the material on a nanometer scale can govern the effective electron dynamics. Our interest is focused on localized collective oszillations of the electron gas in metal particles of nanometer size, the so-called particle plasmons. A. Liebsch predicts that under certain conditions the plasmon dephasing time at off-resonance excitation can be longer than on resonance due to the wavelength dependence of radiation damping. Making use of the Time-Resolved Two-Photon-Photoemission (TR-2PPE), our investigation concentrates on elliptically shaped silver nano-particles under resonant and off-resonant conditions. Experimental results confirming Liebschs theory will be shown.

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