Roughness effects on the hydrogen signal in laser-induced breakdown spectroscopy
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Roughness effects on the hydrogen signal in laser-induced breakdown spectroscopy. / Rapin, W.; Bousquet, B.; Lasue, J.; Meslin, P. Y.; Lacour, J. L.; Fabre, C.; Wiens, R. C.; Frydenvang, Jens; Dehouck, E.; Maurice, S.; Gasnault, O.; Forni, O.; Cousin, A.
In: Spectrochimica Acta Part B: Atomic Spectroscopy, Vol. 137, 01.11.2017, p. 13-22.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Roughness effects on the hydrogen signal in laser-induced breakdown spectroscopy
AU - Rapin, W.
AU - Bousquet, B.
AU - Lasue, J.
AU - Meslin, P. Y.
AU - Lacour, J. L.
AU - Fabre, C.
AU - Wiens, R. C.
AU - Frydenvang, Jens
AU - Dehouck, E.
AU - Maurice, S.
AU - Gasnault, O.
AU - Forni, O.
AU - Cousin, A.
PY - 2017/11/1
Y1 - 2017/11/1
N2 - 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 CO2 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.
AB - 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 CO2 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.
KW - ChemCam
KW - Hydrogen
KW - LIBS
KW - Low pressure
KW - Mars
KW - Roughness
KW - Water
UR - http://www.scopus.com/inward/record.url?scp=85029461354&partnerID=8YFLogxK
U2 - 10.1016/j.sab.2017.09.003
DO - 10.1016/j.sab.2017.09.003
M3 - Journal article
AN - SCOPUS:85029461354
VL - 137
SP - 13
EP - 22
JO - Spectrochimica Acta Part B: Atomic Spectroscopy
JF - Spectrochimica Acta Part B: Atomic Spectroscopy
SN - 0584-8547
ER -
ID: 184072980