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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Signal enhancement in collinear double-pulse laser-induced breakdown spectroscopy applied to different soils

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Author(s):
Nicolodelli, Gustavo [1] ; Senesi, Giorgio Saverio [2] ; Romano, Renan Amon [1, 3] ; de Oliveira Perazzoli, Ivan Luiz [1] ; Bastos Pereira Milori, Debora Marcondes [1]
Total Authors: 5
Affiliation:
[1] Embrapa Instrumentat, BR-13560970 Sao Carlos, SP - Brazil
[2] CNR, Inst Inorgan Methodol & Plasmas, I-70126 Bari - Italy
[3] Univ Sao Paulo, Phys Inst Sao Carlos, IFSC USP, BR-13566590 Sao Carlos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY; v. 111, p. 23-29, SEP 1 2015.
Web of Science Citations: 27
Abstract

Laser-induced breakdown spectroscopy (LIBS) is a well-known consolidated analytical technique employed successfully for the qualitative and quantitative analysis of solid, liquid, gaseous and aerosol samples of very different nature and origin. Several techniques, such as dual-pulse excitation setup, have been used in order to improve LIBS's sensitivity. The purpose of this paper was to optimize the key parameters as excitation wavelength, delay time and interpulse, that influence the double pulse (DP) LIBS technique in the collinear beam geometry when applied to the analysis at atmospheric air pressure of soil samples of different origin and texture from extreme regions of Brazil. Additionally, a comparative study between conventional single pulse (SP) LIBS and DP LIBS was performed. An optimization of DP LIBS system, choosing the correct delay time between the two pulses, was performed allowing its use for different soil types and the use of different emission lines. In general, the collinear DP LIBS system improved the analytical performances of the technique by enhancing the intensity of emission lines of some elements up to about 5 times, when compared with conventional SP-LIBS, and reduced the continuum emission. Further, the IR laser provided the best performance in re-heating the plasma. (C) 2015 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 12/24349-0 - Development and evaluation of a double-pulse LIBS system: Application for soil characterization
Grantee:Gustavo Nicolodelli
Support Opportunities: Scholarships in Brazil - Post-Doctoral