Mathematical modelling of laser-induced particulate formation in direct solid microanalysis |
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| Affiliation: | 1. Estrutura de Missão para a Extensão da Plataforma Continental, Rua Costa Pinto 165, 2770-047 Paço de Arcos, Portugal;2. Universidade de Évora, Instituto de Ciências da Terra, Dep. de Geociências, Rua Romão Ramalho 59, 7000-671 Évora, Portugal;3. Empresa de Desenvolvimento Mineiro, Rua Sampaio e Pina 1 3Dto, 1070-248 Lisboa, Portugal;4. Faculdade de Ciências, Universidade de Lisboa, IDL-Instituto Dom Luiz, Campo Grande, Edifício C8, Piso 3, 1749-016 Lisboa, Portugal;5. Centre for Geobiology, University of Bergen, Allégaten 41, 5007 Bergen, Norway;6. Instituto Politécnico de Lisboa, Instituto Superior de Engenharia de Lisboa (ISEL/ADF), Rua Conselheiro Emídio Navarro 1, 1959-007 Lisboa, Portugal;7. Institut de Physique du Globe de Paris, Sorbonne Paris Cité, CNRS (UMR 7154), 1 Rue Jussieu, 75238 Paris Cedex, France;8. Instituto Português do Mar e da Atmosfera, Rua C do Aeroporto, 1749-077 Lisboa, Portugal;9. Ministério da Agricultura e Mar, Terreiro do Paço, Lisboa, Portugal |
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| Abstract: | ![]()
The mechanism of laser-assisted particulate sampling was investigated by means of theoretical modelling. Bimodal particle size distribution was described as nanosized nuclei condensation in an expanding laser plume, and microsized droplet ejection in a hydrodynamically instable melt pool. Characteristics of the ambient gas turned out to be important in the formation of both size classes. Microparticle formation was found to be a process sensitive to local conditions (deterministic chaos). The model was applied to the case of ablation of silicon. Implications for the use of lasers as microsampling probes will be discussed throughout the article, as well as the impact on different solid sample classes. |
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