Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1240547 | Spectrochimica Acta Part B: Atomic Spectroscopy | 2008 | 5 Pages |
Abstract
Specific expansion phenomena of aerosols generated by near infrared femtosecond laser ablation (NIR-fs-LA) of brass under helium and argon atmosphere were studied. For this purpose, particles were visualized by light scattering using a pulsed laser source. Aerosols were found to be captured in symmetric vortices when striking a solid boundary during their kinetic stage of expansion. Furthermore, high-repetitive LA resulted in the formation of a complex, macroscopic flow pattern driven by a pressure gradient locally built up. Our data indicate that aerosols released under those conditions experience only minor losses of around 1% if they get in contact with the inner walls of ablation cells operated at atmospheric pressures.
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Authors
J. Koch, M. Wälle, S. Schlamp, T. Rösgen, D. Günther,