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Effets d'une impulsion laser infra-rouge femtoseconde sur les micro-nanostructures des mineraux implications pour les analyses in-situ pa LA-ICP-MS

Abstract : Infra Red femtosecond laser ablation coupled to Mass Spectrometry is a powerful tool for in-situ analysis of geological samples. Nevertheless, implications linked to this type of ablation are still not well defined. Transmission Electron Microscopy (TEM) coupled to Focused Ion Beam milling (FIB) allows direct characterization of ablation damage and particles. Thus, IR-femtosecond laser ablation can be considered as stoechiometric and mainly photo-mechanical. Particles are generated by coalescence and agglomeration of condensates in the laser induced plasma. Chemical segregation of elements noticed on measurements is then confined to these processes, themselves dependant on the target composition. The potential of analytical improvement is substantial, in terms of ablation settings and conception of laser systems dedicated to LA-ICP-MS.
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Submitted on : Wednesday, April 6, 2011 - 4:50:41 PM
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François Xavier d' Abzac. Effets d'une impulsion laser infra-rouge femtoseconde sur les micro-nanostructures des mineraux implications pour les analyses in-situ pa LA-ICP-MS. Planète et Univers [physics]. Université Paul Sabatier - Toulouse III, 2010. Français. ⟨tel-00583820⟩

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