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Proceedings Paper

Dynamics of photodesorption of small particles bound to cluster surfaces
Author(s): Frank Balzer; M. Renger; Horst-Guenter Rubahn
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Paper Abstract

The photodesorption of Na atoms from Na clusters deposited on dielectric surfaces is investigated via pulsed laser excitation and cw two-photon laser-induced fluorescence detection. The combination of pulsed excitation and cw detection within the focii of two counterpropagating lasers provides high spatial resolution (allowing one to obtain accurate angular and kinetic energy distributions) while at the same time preserving the high temporal resolution given by the pulsed laser. Moreover, spatial overlap of desorption and detection lasers on the surface facilitates to follow directly the conversion of initial surface plasmon excitation into bond-breaking in the clusters or phonon excitation in the substrate. It is found that the final step of photodesorption of Na from large Na clusters bound to mica surfaces can be described via multiphonon scattering of the desorbing particles from the surface of the clusters (with nearly zero initial kinetic energy). By use of lithium fluoride as the supporting substrate it is observed that the activation energy for photodesorption from the clusters depends on the Debye temperature of the supporting substrate. This emphasizes the need to include coupling between clusters and substrate in order to understand the overall desorption process.

Paper Details

Date Published: 21 July 1994
PDF: 12 pages
Proc. SPIE 2125, Laser Techniques for Surface Science, (21 July 1994); doi: 10.1117/12.180848
Show Author Affiliations
Frank Balzer, Max-Planck-Institut fuer Stroemungforschung (Germany)
M. Renger, Max-Planck-Institut fuer Stroemungforschung (Germany)
Horst-Guenter Rubahn, Max-Planck-Institut fuer Stroemungforschung (Germany)

Published in SPIE Proceedings Vol. 2125:
Laser Techniques for Surface Science
Hai-Lung Dai; Steven J. Sibener, Editor(s)

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