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Roughness effects on the hydrogen signal in laser-induced breakdown spectroscopy

Rapin, W. and Bousquet, B. and Lasue, J. and Meslin, P.-Y. and Lacour, J.-L. and Fabre, C. and Wiens, R. C. and Frydenvang, J. and Dehouck, E. and Maurice, S. and Gasnault, O. and Forni, O. and Cousin, A. (2017) Roughness effects on the hydrogen signal in laser-induced breakdown spectroscopy. Spectrochimica Acta Part B: Atomic Spectroscopy, 137 . pp. 13-22. ISSN 0584-8547.

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On Mars, Laser-Induced Breakdown Spectroscopy (LIBS) as performed by the ChemCam instrument can be used to measure the hydrogen content of targets in situ, under a low pressure CO_2 atmosphere. However, unexpected variations observed in the Martian dataset suggest an effect related to target roughness. Here, we present a series of laboratory experiments that reproduce the effect observed on Mars and explore possible causes. We show that the hydrogen peak intensity increases significantly with increasing exposure of the target surface to the LIBS plasma, and that these variations are specific to hydrogen, as other emission lines in the spectra are not affected. The increase of the signal could be related to an addition of hydrogen to the plasma due to interaction with the surrounding target surface, yet the exact physical process to explain such effect remains to be identified. More generally, this effect should be taken into account for the quantification of hydrogen in any LIBS applications where the roughness of the target is significant.

Item Type:Article
Related URLs:
URLURL TypeDescription
Rapin, W.0000-0003-4660-8006
Lasue, J.0000-0001-9082-4457
Meslin, P.-Y.0000-0002-0703-3951
Fabre, C.0000-0001-8627-4050
Wiens, R. C.0000-0002-3409-7344
Frydenvang, J.0000-0001-9294-1227
Dehouck, E.0000-0002-1368-4494
Gasnault, O.0000-0002-6979-9012
Forni, O.0000-0001-6772-9689
Cousin, A.0000-0001-7823-7794
Additional Information:© 2017 Elsevier B.V. Received 13 April 2017, Revised 12 July 2017, Accepted 9 September 2017, Available online 11 September 2017.
Subject Keywords:LIBS; Water; Hydrogen; ChemCam; Mars; Low pressure; Roughness
Record Number:CaltechAUTHORS:20170925-074626234
Persistent URL:
Official Citation:W. Rapin, B. Bousquet, J. Lasue, P.-Y. Meslin, J.-L. Lacour, C. Fabre, R.C. Wiens, J. Frydenvang, E. Dehouck, S. Maurice, O. Gasnault, O. Forni, A. Cousin, Roughness effects on the hydrogen signal in laser-induced breakdown spectroscopy, Spectrochimica Acta Part B: Atomic Spectroscopy, Volume 137, 1 November 2017, Pages 13-22, ISSN 0584-8547, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81790
Deposited By: Tony Diaz
Deposited On:25 Sep 2017 18:05
Last Modified:09 Mar 2020 13:18

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