A1 Journal article (refereed)
Time-gated Raman and laser-induced breakdown spectroscopy in mapping of eudialyte and catapleiite (2020)

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

JYU authors or editors

Publication details

All authors or editors: Romppanen, Sari; Häkkänen, Heikki; Kekkonen, Jere; Nissinen, Jan; Nissinen, Ilkka; Kostamovaara, Juha; Kaski, Saara

Journal or series: Journal of Raman Spectroscopy

ISSN: 0377-0486

eISSN: 1097-4555

Publication year: 2020

Volume: 51

Issue number: 9

Pages range: 1462-1469

Publisher: John Wiley & Sons Ltd.

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1002/jrs.5622

Publication open access: Not open

Publication channel open access: 

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/67133

Additional information: Special Issue: GeoRaman 2018.

Abstract

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.

Keywords: spectroscopy

Free keywords: laser-induced breakdown spectroscopy (LIBS); mineral mapping; REE&-bearing minerals; rock analysis; time-gated Raman

Contributing organizations

Related projects

Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 1