Time-gated Raman and laser-induced breakdown spectroscopy in mapping of eudialyte and catapleiite
Romppanen, S., Häkkänen, H., Kekkonen, J., Nissinen, J., Nissinen, I., Kostamovaara, J., & Kaski, S. (2020). Time-gated Raman and laser-induced breakdown spectroscopy in mapping of eudialyte and catapleiite. Journal of Raman Spectroscopy, 51(9), 1462-1469. https://doi.org/10.1002/jrs.5622
Published inJournal of Raman Spectroscopy
© 2019 John Wiley & Sons, Ltd.
Raman analysis of rock samples containing rare earth elements (REEs) is challenging due to the strong fluorescence, which may mask the weaker Raman signal. In this research, time‐gated (TG) Raman has been applied to the construction of the mineral distribution map from REE‐bearing rock. With TG Raman, material is excited with a short subnanosecond laser pulse, and the Raman signal is collected within a picosecond‐scale time window prior to the formation of a strong fluorescent signal by means of single‐photon avalanche diode array. This allows signal readout with a significantly reduced fluorescence background. TG Raman maps are used to reveal the location of valuable minerals and are compared with the elemental distribution given by laser‐induced breakdown spectroscopy. The analysis was carried out from a REE‐bearing rock, nepheline syenite sample from the Norra Kärr deposit, where REEs are mainly hosted in eudialyte and catapleiite. The combination of these two complimentary laser spectroscopic methods offers valuable elemental and mineralogical information about rocks. ...
PublisherJohn Wiley & Sons Ltd.
Publication in research information system
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Related funder(s)Academy of Finland
Funding program(s)Academy Project, AoF
Additional information about fundingThe work has been funded by the Academy of Finland (decision number 281955 for S. R. and S. K., 282240 for H. H., 292609 for J. Ko, and 282405 for J. Ke, I. N., J. N., and J.Ko. S. R. would also like to thank the Finnish Society of Sciences and Letters as well as Società Italiana di Mineralogia e Petrologia for the travel grants, which gave opportunity to present the related results in GeoRaman 2018 conference. The analysed sample was provided by Tasman Metals AB (now Leading Edge Materials). ...
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