Joint analyses by laser-induced breakdown spectroscopy (LIBS) and Raman spectroscopy at stand-off distances.
Raman spectroscopy and laser-induced breakdown spectroscopy (LIBS) of solid samples have both been shown to be feasible with sample-to-instrument distances of many meters. The two techniques are very useful together, as the combination of elemental compositions from LIBS and molecular vibrational information from Raman spectroscopy strongly complement each other. Remote LIBS and Raman spectroscopy spectra were taken together on a number of mineral samples including sulfates, carbonates and silicates at a distance of 8.3 m. The complementary nature of these spectra is highlighted and discussed. A factor of approximately 20 difference in intensity was observed between the brightest Raman line of calcite, at optimal laser power, and the brighter Ca I LIBS emission line measured with 55 mJ/pulse laser power. LIBS and Raman spectroscopy have several obstacles to devising a single instrument capable of both techniques. These include the differing spectral ranges and required detection sensitivity. The current state of technology in these areas is discussed.
Wiens
Roger C
RC
Space Science and Applications, Mail Stop D-466, Los Alamos National Laboratory, Los Alamos, NM 87544, USA. rwiens@lanl.gov
Sharma
Shiv K
SK
Thompson
Justin
J
Misra
Anupam
A
Lucey
Paul G
PG
D001466:Barium Sulfate / Q000737:chemistry; D002119:Calcium Carbonate / Q000737:chemistry; D002133:Calcium Sulfate / Q000737:chemistry; D008274:Magnesium / Q000737:chemistry; D012824:Silicic Acid / Q000737:chemistry; D013059:Spectrum Analysis, Raman
D012824:Silicic Acid; C074224:diopside; D001466:Barium Sulfate; D002119:Calcium Carbonate; D008274:Magnesium; C028042:calcium magnesium carbonate; D002133:Calcium Sulfate