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Title: Significance of ambient conditions in uranium absorption and emission features of laser ablation plasmas

Abstract

This study employs laser ablation (LA) to investigate mechanisms for U optical signal variation under various environmental conditions during laser absorption spectroscopy (LAS) and optical emission spectroscopy (OES). Potential explored mechanisms for signal quenching related to ambient conditions include plasma chemistry (e.g., uranium oxide formation), ambient gas confinement effects, and other collisional interactions between plasma constituents and the ambient gas. LA-LAS studies show that the persistence of the U ground state population is significantly reduced in the presence of air ambient compared to nitrogen. LA-OES results yield congested spectra from which the U I 356.18 nm transition is prominent and serves as the basis for signal tracking. LA-OES signal and persistence vary negligibly between the test gases (air and N2), unlike the LA-LAS results. The plume hydrodynamic features and plume fundamental properties showed similar results in both air and nitrogen ambient. Investigation of U oxide formation in the laser-produced plasma suggests that low U concentration in a sample hinders consistent detection of UO molecular spectra.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1336007
Report Number(s):
PNNL-SA-117730
Journal ID: ISSN 0584-8547; DN2001000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Spectrochimica Acta. Part B, Atomic Spectroscopy
Additional Journal Information:
Journal Volume: 125; Journal Issue: C; Journal ID: ISSN 0584-8547
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Skrodzki, P. J., Shah, N. P., Taylor, N., Hartig, K. C., LaHaye, N. L., Brumfield, B. E., Jovanovic, I., Phillips, M. C., and Harilal, S. S. Significance of ambient conditions in uranium absorption and emission features of laser ablation plasmas. United States: N. p., 2016. Web. doi:10.1016/j.sab.2016.09.012.
Skrodzki, P. J., Shah, N. P., Taylor, N., Hartig, K. C., LaHaye, N. L., Brumfield, B. E., Jovanovic, I., Phillips, M. C., & Harilal, S. S. Significance of ambient conditions in uranium absorption and emission features of laser ablation plasmas. United States. doi:10.1016/j.sab.2016.09.012.
Skrodzki, P. J., Shah, N. P., Taylor, N., Hartig, K. C., LaHaye, N. L., Brumfield, B. E., Jovanovic, I., Phillips, M. C., and Harilal, S. S. Tue . "Significance of ambient conditions in uranium absorption and emission features of laser ablation plasmas". United States. doi:10.1016/j.sab.2016.09.012.
@article{osti_1336007,
title = {Significance of ambient conditions in uranium absorption and emission features of laser ablation plasmas},
author = {Skrodzki, P. J. and Shah, N. P. and Taylor, N. and Hartig, K. C. and LaHaye, N. L. and Brumfield, B. E. and Jovanovic, I. and Phillips, M. C. and Harilal, S. S.},
abstractNote = {This study employs laser ablation (LA) to investigate mechanisms for U optical signal variation under various environmental conditions during laser absorption spectroscopy (LAS) and optical emission spectroscopy (OES). Potential explored mechanisms for signal quenching related to ambient conditions include plasma chemistry (e.g., uranium oxide formation), ambient gas confinement effects, and other collisional interactions between plasma constituents and the ambient gas. LA-LAS studies show that the persistence of the U ground state population is significantly reduced in the presence of air ambient compared to nitrogen. LA-OES results yield congested spectra from which the U I 356.18 nm transition is prominent and serves as the basis for signal tracking. LA-OES signal and persistence vary negligibly between the test gases (air and N2), unlike the LA-LAS results. The plume hydrodynamic features and plume fundamental properties showed similar results in both air and nitrogen ambient. Investigation of U oxide formation in the laser-produced plasma suggests that low U concentration in a sample hinders consistent detection of UO molecular spectra.},
doi = {10.1016/j.sab.2016.09.012},
journal = {Spectrochimica Acta. Part B, Atomic Spectroscopy},
issn = {0584-8547},
number = C,
volume = 125,
place = {United States},
year = {2016},
month = {11}
}