Expansion phenomena of aerosols generated by laser ablation under helium and argon atmosphere |
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Authors: | J. Koch,M. Wä lle,S. Schlamp,T. Rö sgen,D. Gü nther |
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Affiliation: | 1. Swiss Federal Institute of Technology, Laboratory of Inorganic Chemistry, Wolfgang-Pauli-Straße 10, ETH Zürich, CH-8093 Zürich, Switzerland; b Swiss Federal Institute of Technology, Institute of Fluid Dynamics, Sonneggstraße 3, ETH Zürich, CH-8092 Zürich, Switzerland |
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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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Keywords: | Femtosecond laser ablation Aerosol transportation Laser-induced scattering Visualization Inductively coupled plasma mass spectrometry |
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