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Title: Quantitative laser-induced breakdown spectroscopy data using peak area step-wise regression analysis: an alternative method for interpretation of Mars science laboratory results

Quantitative laser-induced breakdown spectroscopy data using peak area step-wise regression analysis: an alternative method for interpretation of Mars science laboratory results 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.
Authors: ; ; ; ; ;
Publication Date:
OSTI Identifier:956617
Report Number(s):LA-UR-08-07585; LA-UR-08-7585
Journal ID: ISSN 0094-8276; GPRLAJ; TRN: US201016%%2302
DOE Contract Number:AC52-06NA25396
Resource Type:Journal Article
Data Type:
Resource Relation:Journal Name: Geophysical Research Letters
Research Org:Los Alamos National Laboratory (LANL)
Sponsoring Org:DOE
Country of Publication:United States
Language:English
Subject: 37; 58; BREAKDOWN; CALIBRATION; CHEMISTRY; DATA ANALYSIS; DIAGRAMS; ELEMENTS; IGNEOUS ROCKS; MARS PLANET; METAMORPHIC ROCKS; REGRESSION ANALYSIS; ROCKS; SPECTROMETERS; SPECTROSCOPY; VALIDATION