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Title: Spectroscopic signatures and oxidation characteristics of nanosecond laser-induced cerium plasmas

Abstract

Improving technologies related to the wide area environmental sampling of nuclear materials supports the nuclear nonproliferation mission of preventing the proliferation of nuclear weapons by monitoring nuclear weapons tests and detecting undeclared nuclear fuel cycle activities. Standoff, laser-based detection techniques such as laser-induced breakdown spectroscopy have the potential to offer robust, field-deployable methods that provide rapid element-specific and phase identifiable measurements over a wide range of materials. This work aims to elucidate the effects of atmospheric conditions and oxidation reactions on the highly complex and transient spectroscopic signatures of laser-induced plutonium surrogate plasmas. Time-resolved spectra of nanosecond laser ablation cerium plasmas were measured using laser-induced breakdown spectroscopy in a range of atmospheres containing low to high concentrations of oxygen. Here, the growth of strong CeO molecular emission bands was observed in the visible spectrum, where it was shown that the persistence of CeO is reduced from around 60 μs to 50 μs in oxygen rich atmospheric environments. To further investigate the growth and depletion of CeO in the laser-produced plasma, ratios of CeO-to-Ce emission were generated using integrated intensities corresponding to the Q-branch of the CeO D1-X1 transitions and numerous strong atomic Ce peaks. It was determined that the fastestmore » rate of formation of CeO in argon occurred for moderate oxygen mass fractions between 0.10 and 0.15 while the ratios were reduced at higher oxygen mass fractions (i.e., YO2 = 0.20) due to competing oxidation reactions and lower plasma temperatures.« less

Authors:
 [1];  [2];  [1]
  1. Univ. of Florida, Gainesville, FL (United States)
  2. Savannah River National Lab., Aiken, SC (United States)
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1916462
Grant/Contract Number:  
NA0003920
Resource Type:
Accepted Manuscript
Journal Name:
Spectrochimica Acta. Part B, Atomic Spectroscopy
Additional Journal Information:
Journal Volume: 200; Journal ID: ISSN 0584-8547
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Cerium; Laser ablation; Laser-induced breakdown spectroscopy; Plasma chemistry; Oxidation

Citation Formats

Kwapis, Emily H., Villa-Aleman, Eliel, and Hartig, Kyle C. Spectroscopic signatures and oxidation characteristics of nanosecond laser-induced cerium plasmas. United States: N. p., 2022. Web. doi:10.1016/j.sab.2022.106610.
Kwapis, Emily H., Villa-Aleman, Eliel, & Hartig, Kyle C. Spectroscopic signatures and oxidation characteristics of nanosecond laser-induced cerium plasmas. United States. https://doi.org/10.1016/j.sab.2022.106610
Kwapis, Emily H., Villa-Aleman, Eliel, and Hartig, Kyle C. Wed . "Spectroscopic signatures and oxidation characteristics of nanosecond laser-induced cerium plasmas". United States. https://doi.org/10.1016/j.sab.2022.106610. https://www.osti.gov/servlets/purl/1916462.
@article{osti_1916462,
title = {Spectroscopic signatures and oxidation characteristics of nanosecond laser-induced cerium plasmas},
author = {Kwapis, Emily H. and Villa-Aleman, Eliel and Hartig, Kyle C.},
abstractNote = {Improving technologies related to the wide area environmental sampling of nuclear materials supports the nuclear nonproliferation mission of preventing the proliferation of nuclear weapons by monitoring nuclear weapons tests and detecting undeclared nuclear fuel cycle activities. Standoff, laser-based detection techniques such as laser-induced breakdown spectroscopy have the potential to offer robust, field-deployable methods that provide rapid element-specific and phase identifiable measurements over a wide range of materials. This work aims to elucidate the effects of atmospheric conditions and oxidation reactions on the highly complex and transient spectroscopic signatures of laser-induced plutonium surrogate plasmas. Time-resolved spectra of nanosecond laser ablation cerium plasmas were measured using laser-induced breakdown spectroscopy in a range of atmospheres containing low to high concentrations of oxygen. Here, the growth of strong CeO molecular emission bands was observed in the visible spectrum, where it was shown that the persistence of CeO is reduced from around 60 μs to 50 μs in oxygen rich atmospheric environments. To further investigate the growth and depletion of CeO in the laser-produced plasma, ratios of CeO-to-Ce emission were generated using integrated intensities corresponding to the Q-branch of the CeO D1-X1 transitions and numerous strong atomic Ce peaks. It was determined that the fastest rate of formation of CeO in argon occurred for moderate oxygen mass fractions between 0.10 and 0.15 while the ratios were reduced at higher oxygen mass fractions (i.e., YO2 = 0.20) due to competing oxidation reactions and lower plasma temperatures.},
doi = {10.1016/j.sab.2022.106610},
journal = {Spectrochimica Acta. Part B, Atomic Spectroscopy},
number = ,
volume = 200,
place = {United States},
year = {Wed Dec 21 00:00:00 EST 2022},
month = {Wed Dec 21 00:00:00 EST 2022}
}

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