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Proceedings Paper

Mechanisms of nanoparticle formation by short laser pulses
Author(s): Tatiana E. Itina; Mikhail E. Povarnitsyn; Karine Gouriet; Sylvie Noël; Jörg Hermann
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Paper Abstract

Numerical modeling is performed to study cluster formation by laser ablation. The developed model allows us to compare the relative contribution of the two channels of the cluster production by laser ablation: (i) direct cluster ejection upon the laser-material interaction, and (ii) collisional sticking, evaporation and coalescence during the ablation plume expansion. Both of these mechanisms are found to affect the final cluster size distribution. Plume cluster composition is correlated with plume dynamics. The results of the calculations demonstrate that cluster precursors are formed during material ablation through both thermal and mechanical target decomposition processes. Then, clusters react in collisions within the plume. In vacuum, rapid plume expansion and cooling take place leading to the overall decrease in the reaction rates. In the presence of a gas, additional collisions with background gas species affect the cluster size distribution. Growth of larger clusters can be observed at this stage. Calculation results explain several recent experimental observations.

Paper Details

Date Published: 13 March 2007
PDF: 8 pages
Proc. SPIE 6458, Photon Processing in Microelectronics and Photonics VI, 64581U (13 March 2007); doi: 10.1117/12.698498
Show Author Affiliations
Tatiana E. Itina, Lab. of Lasers, Plasmas and Photonic Processing CNRS (France)
Mikhail E. Povarnitsyn, Institute for High Energy Densities (Russia)
Karine Gouriet, Lab. of Lasers, Plasmas and Photonic Processing CNRS (France)
Sylvie Noël, Lab. of Lasers, Plasmas and Photonic Processing CNRS (France)
Jörg Hermann, Lab. of Lasers, Plasmas and Photonic Processing CNRS (France)


Published in SPIE Proceedings Vol. 6458:
Photon Processing in Microelectronics and Photonics VI
David B. Geohegan; Frank Träger; Jan J. Dubowski; Craig B. Arnold; Tatsuo Okada; Michel Meunier; Andrew S. Holmes, Editor(s)

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