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Title: Theoretical and experimental investigation of matrix effects observed in emission spectra of binary mixtures of sodium and copper and magnesium and copper pressed powders

Here, the goal of this work was to investigate the matrix effect of copper in the presence of sodium or magnesium in a laser-induced plasma. Varying amounts of copper were mixed and pressed with a constant amount of sodium or magnesium and a stearic acid binder. Experimental parameters such as delay time and laser pulse energy were varied to observe trends in the emission intensity of the Na I 588.99 nm, Na I 589.59 nm, Mg I 277.98 nm, and Mg II 279.08 nm lines. Experimental observations are supported by theoretical calculations and modeling that show the Na I and Mg I emission intensities increase in the presence of copper while the Mg II line intensity decreases due to the increase in electron density (Ne) of the plasma when copper is added. Lastly, the increase in electron density changes the population of the atomic species within the plasma through an increase in recombination of ions with electrons, shifting the populations toward more neutral states, providing an explanation for the observed matrix effects found in these, and many previous, studies.
Authors:
ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-15-29641
Journal ID: ISSN 0584-8547
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Spectrochimica Acta. Part B, Atomic Spectroscopy
Additional Journal Information:
Journal Volume: 122; Journal Issue: C; Journal ID: ISSN 0584-8547
Publisher:
Elsevier
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Matrix effects; LIBS; Theoretical modeling of laser induced plasma; Electron density
OSTI Identifier:
1457273
Alternate Identifier(s):
OSTI ID: 1430390

Judge, Elizabeth J., Colgan, James Patrick, Campbell, Keri, Barefield II, James E., Johns, Heather Marie, Kilcrease, David Parker, and Clegg, Samuel M.. Theoretical and experimental investigation of matrix effects observed in emission spectra of binary mixtures of sodium and copper and magnesium and copper pressed powders. United States: N. p., Web. doi:10.1016/j.sab.2016.06.004.
Judge, Elizabeth J., Colgan, James Patrick, Campbell, Keri, Barefield II, James E., Johns, Heather Marie, Kilcrease, David Parker, & Clegg, Samuel M.. Theoretical and experimental investigation of matrix effects observed in emission spectra of binary mixtures of sodium and copper and magnesium and copper pressed powders. United States. doi:10.1016/j.sab.2016.06.004.
Judge, Elizabeth J., Colgan, James Patrick, Campbell, Keri, Barefield II, James E., Johns, Heather Marie, Kilcrease, David Parker, and Clegg, Samuel M.. 2016. "Theoretical and experimental investigation of matrix effects observed in emission spectra of binary mixtures of sodium and copper and magnesium and copper pressed powders". United States. doi:10.1016/j.sab.2016.06.004. https://www.osti.gov/servlets/purl/1457273.
@article{osti_1457273,
title = {Theoretical and experimental investigation of matrix effects observed in emission spectra of binary mixtures of sodium and copper and magnesium and copper pressed powders},
author = {Judge, Elizabeth J. and Colgan, James Patrick and Campbell, Keri and Barefield II, James E. and Johns, Heather Marie and Kilcrease, David Parker and Clegg, Samuel M.},
abstractNote = {Here, the goal of this work was to investigate the matrix effect of copper in the presence of sodium or magnesium in a laser-induced plasma. Varying amounts of copper were mixed and pressed with a constant amount of sodium or magnesium and a stearic acid binder. Experimental parameters such as delay time and laser pulse energy were varied to observe trends in the emission intensity of the Na I 588.99 nm, Na I 589.59 nm, Mg I 277.98 nm, and Mg II 279.08 nm lines. Experimental observations are supported by theoretical calculations and modeling that show the Na I and Mg I emission intensities increase in the presence of copper while the Mg II line intensity decreases due to the increase in electron density (Ne) of the plasma when copper is added. Lastly, the increase in electron density changes the population of the atomic species within the plasma through an increase in recombination of ions with electrons, shifting the populations toward more neutral states, providing an explanation for the observed matrix effects found in these, and many previous, studies.},
doi = {10.1016/j.sab.2016.06.004},
journal = {Spectrochimica Acta. Part B, Atomic Spectroscopy},
number = C,
volume = 122,
place = {United States},
year = {2016},
month = {6}
}