International Geologiical Congress - Oslo 2008


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MPM-12 New developments in microbeam techniques


Femtosecond laser ablation of garnets and quartz and Implications for micro-geochemistry and geochronology


Dailto Silva, State University of Campinas (Brazil)
Aloisio J. B Cotta, State University of Campinas (Brazil)
Eugenio Rodriguez, State University of Campinas (Brazil)
C. R. de Souza Filho, State University of Campinas (Brazil)


Laser ablation provides significant benefits for mineral chemical analysis by ICPMS. The main objective of this work is to understand how the femtosecond pulses might be used for a decrease the fractionation during the ablation process when the sample aerosol is formed. Pulsed femtosecond (130 fs) laser ablation, with different wavelengths (800 and 200 nm) at 10 Hz, with identical fluence and different rates, was used to compare the interactions between wavelength, morphology of ablation craters and particles yielded. Measurements were made on NIST SRM glasses, quartz and garnets with different colours. The diameters and size distribution of particulates were measured using scanning electron microscope (SEM) images of the ablated aerosol. These SEM images show that fluence, wavelength and different kind of samples have a significant influence on the diameters and size distribution of the particles, with important implications to micro-geochemistry and geochronology.


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