Quantitative laser-induced breakdown spectroscopy data using peak area step-wise regression analysis: an alternative method for interpretation of Mars science laboratory results
Description/Abstract
The ChemCam instrument on the Mars Science Laboratory (MSL) will include a laser-induced breakdown spectrometer (LIBS) to quantify major and minor elemental compositions. The traditional analytical chemistry approach to calibration curves for these data regresses a single diagnostic peak area against concentration for each element. This approach contrasts with a new multivariate method in which elemental concentrations are predicted by step-wise multiple regression analysis based on areas of a specific set of diagnostic peaks for each element. The method is tested on LIBS data from igneous and metamorphosed rocks. Between 4 and 13 partial regression coefficients are needed to describe each elemental abundance accurately (i.e., with a regression line of R{sup 2} > 0.9995 for the relationship between predicted and measured elemental concentration) for all major and minor elements studied. Validation plots suggest that the method is limited at present by the small data set, and will work best for prediction of concentration when a wide variety of compositions and rock types has been analyzed.
| Creator/Author: | Clegg, Samuel M [Los Alamos National Laboratory] ; Barefield, James E [Los Alamos National Laboratory] ; Wiens, Roger C [Los Alamos National Laboratory] ; Dyar, Melinda D [MT HOLYOKE COLLEGE] ; Schafer, Martha W [LSU] ; Tucker, Jonathan M [MT HOLYOKE COLLEGE] |
|---|---|
| Publication Date: | 2008 Jan 01 |
| OSTI Identifier: | OSTI ID: 956617 |
| Report Number(s): | LA-UR-08-07585; LA-UR-08-7585 |
| DOE Contract Number: | AC52-06NA25396 |
| Other Number(s): | Journal ID: ISSN 0094-8276; GPRLAJ; TRN: US201016%%2302 |
| Resource Type: | Journal Article |
| Resource Relation: | Journal Name: Geophysical Research Letters |
| Research Org: | Los Alamos National Laboratory (LANL) |
| Sponsoring Org: | DOE |
| Subject: | 37; 58; BREAKDOWN; CALIBRATION; CHEMISTRY; DATA ANALYSIS; DIAGRAMS; ELEMENTS; IGNEOUS ROCKS; MARS PLANET; METAMORPHIC ROCKS; REGRESSION ANALYSIS; ROCKS; SPECTROMETERS; SPECTROSCOPY; VALIDATION |
| Country of Publication: | United States |
| Language: | English |
| Update Date: | 2010 Sep 22 |
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