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Evaluation of compact VUV spectrometer for elemental imaging by laser-induced breakdown spectroscopy: application to mine core characterization

Abstract

This work introduces a new approach to perform LIBS elemental imaging in the vacuum ultraviolet (VUV) wavelength range by using an argon purged probe coupled to a compact spectrometer. In spite of several important elements for geological and industrial applications such as S, P, As, B, C, or Zn presenting strong lines in the VUV range, the need of using specific optics and working under free-oxygen conditions has limited the extension of LIBS systems available for such range. Herein, we present an adaptation of our LIBS imaging instrumentation to access to the VUV while operating at ambient conditions. The proposed detection system is based on an optical probe directly coupled to a Maya2000Pro compact spectrometer (Ocean Optics), the all being purged with argon. The technical design along with a detailed evaluation of the VUV probe are addressed. The possibility to use this VUV probe for LIBS imaging is also investigated by studying a Canadian mine core sample with special emphasis to the detection of sulfur. In addition to sulfur, more than 15 elements including P, As, C, Ca, Si, Mo, B, and Zn have also been detected. Elemental images covering sample surfaces in the range of cm² with a micrometric spatial resolution (10 μm) are presented. A detection limit of 0.2 wt% for sulfur is demonstrated in a single shot configuration. These results open new perspectives for both conventional LIBS and LIBS-based imaging in various application fields.

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Publication details

The article was received on 12 May 2017, accepted on 13 Jun 2017 and first published on 16 Jun 2017


Article type: Paper
DOI: 10.1039/C7JA00185A
Citation: J. Anal. At. Spectrom., 2017, Accepted Manuscript
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    Evaluation of compact VUV spectrometer for elemental imaging by laser-induced breakdown spectroscopy: application to mine core characterization

    F. Trichard, S. Moncayo, D. Devismes, F. Pelascini, J. Maurelli, A. Feugier, C. Sasseville, F. Surma and V. Motto-Ros, J. Anal. At. Spectrom., 2017, Accepted Manuscript , DOI: 10.1039/C7JA00185A

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