Berlin 2005 – wissenschaftliches Programm
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MO: Molekülphysik
MO 14: Clusters of Atoms and Small Molecules
MO 14.3: Vortrag
Freitag, 4. März 2005, 17:15–17:30, HU 2091
Size-dependent study of hot electron relaxation dynamics in tungsten cluster anions — •Jörg Stanzel, Florian Burmeister, Matthias Neeb, and Wolfgang Eberhardt — BESSY GmbH, Albert-Einstein-Str. 15, 12489 Berlin
Electron dynamics in metal clusters are influenced by individual properties like geometry and electronic structure. Therefore clusters comprised of a small number of atoms underlie a strong size dependence. To address this issue a number of pump & probe measurements have been reported so far, some concentrated on sizes of a few atoms [1], others on nanoparticles with sizes ranging from 2.2-30 nm [2].
Here we present a study of hot electron relaxation dynamics in small mass-selected tungsten cluster anions (Wn−) in the gas phase. Relaxation time constants were obtained using femtosecond time-resolved pump & probe photodetachment spectroscopy.
[1] N. Pontius et al. Phys. Rev. Lett. 84, 1132 (2000); N. Pontius et al., Phys. Rev. B 67, 035425 (2003); YD. Kim et al., Phys. Rev. B 70, 035421 (2004).
[2] A. Arbouet et al., Phys. Rev. Lett. 90, 177401 (2003).