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Proceedings Paper

Numerical study of gas-phase cluster synthesis under ns laser ablation
Author(s): Nadezhda M. Bulgakova; Alexander V. Bulgakov
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Paper Abstract

A theoretical study of cluster formation in the plume produced by nanosecond laser pulses of moderate intensity in vacuum is undertaken on the basis of the Smoluchowski rate equations. Dynamics of the laser-induced plume expansion is described in a spherical approximation, taking into account ionization/recombination kinetics, the heat release to the plasma flow due to condensation and three-body recombination, and the vibrational relaxation of clusters. As a model system, carbon cluster formation in the plume during pulsed laser ablation of graphite has been studied. The Cn particles with n = 1-100 are considered with allowance for the isomers (chains, rings, fullerenes). The cluster collision cross sections are evaluated from the experimental data. Calculations with various initial compositions of the vaporized material (different ratios of atoms, dimers and trimers) have shown a strong impact of this factor on the expansion and ionization dynamics of the plume. The obtained results on the cluster size distribution and impact of the cluster internal degrees of freedom on the cluster growth process are analyzed in comparison with available experimental data.

Paper Details

Date Published: 2 July 2007
PDF: 9 pages
Proc. SPIE 6732, International Conference on Lasers, Applications, and Technologies 2007: Laser-assisted Micro- and Nanotechnologies, 67320G (2 July 2007); doi: 10.1117/12.751900
Show Author Affiliations
Nadezhda M. Bulgakova, Institute of Thermophysics (Russia)
Alexander V. Bulgakov, Institute of Thermophysics (Russia)

Published in SPIE Proceedings Vol. 6732:
International Conference on Lasers, Applications, and Technologies 2007: Laser-assisted Micro- and Nanotechnologies
Vladislav Panchenko; Oleg Louchev; Sergei Malyshev, Editor(s)

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