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Romppanen, S, Häkkänen, H, Kekkonen, J, et al. Time‐gated Raman and laser‐induced breakdown spectroscopy in mapping of eudialyte and catapleiite. J Raman Spectrosc. 2020; 51: 1462– 1469. https://doi.org/10.1002/jrs.5622

Time‐gated Raman and laser‐induced breakdown spectroscopy in mapping of eudialyte and catapleiite

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Author: Romppanen, Sari1; Häkkänen, Heikki2; Kekkonen, Jere3;
Organizations: 1Department of Chemistry, University of Jyvaskyla, Jyvaskyla, Finland
2Department of Biological and Environmental Science, University of Jyvaskyla, Jyvaskyla, Finland
3Circuits and Systems Research Unit, University of Oulu, Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.8 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2019121848794
Language: English
Published: John Wiley & Sons, 2020
Publish Date: 2020-05-15
Description:

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.

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Series: Journal of Raman spectroscopy
ISSN: 0377-0486
ISSN-E: 1097-4555
ISSN-L: 0377-0486
Volume: 51
Issue: 9
Pages: 1462 - 1469
DOI: 10.1002/jrs.5622
OADOI: https://oadoi.org/10.1002/jrs.5622
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
1171 Geosciences
213 Electronic, automation and communications engineering, electronics
Subjects:
REE‐bearing minerals
laser‐induced breakdown spectroscopy (LIBS)
mineral mapping
rock analysis
time‐gated Raman
Article
Funding: The 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.
Academy of Finland Grant Number: 292609
282405
Detailed Information: 292609 (Academy of Finland Funding decision)
282405 (Academy of Finland Funding decision)
Copyright information: This is the peer reviewed version of the following article: Romppanen, S, Häkkänen, H, Kekkonen, J, et al. Time‐gated Raman and laser‐induced breakdown spectroscopy in mapping of eudialyte and catapleiite. J Raman Spectrosc. 2020; 51: 1462– 1469. https://doi.org/10.1002/jrs.5622, which has been published in final form at https://doi.org/10.1002/jrs.5622. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.