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20 February 2008 Dynamics of laser-excited nanoparticles
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By the use of stroboscopic laser pump - x-ray probe techniques and x-ray scanning techniques the structural relaxations of gold nanoparticles have been resolved on the 50 ps time scale. The structural dynamics are addressed by several methods including power scattering and small angle scattering (SAXS) to resolve microscopic and mesoscopic length scales of the composite system. The laser power is a direct measure of the dissipated heat. Thus the caloric reaction and melting transition can be monitored as function of temperature, particle size and time. Nonlinear effects are observed with femtosecond excitation, attributed to ablation. While the phenomenology for nanoparticle suspensions and surface supported monolayers display similar energetics, structure formation processes are strongly altered on the surface due to interparticle interactions.
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Anton Plech, Andreas Siems, Vassilios Kotaidis, and Andreas Menzel "Dynamics of laser-excited nanoparticles", Proc. SPIE 6879, Photon Processing in Microelectronics and Photonics VII, 68790H (20 February 2008);

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