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Title: Plume Dynamics and Gas-phase Molecular Formation in Transient Laser-produced Uranium Plasmas

Abstract

The dynamics of expansion, thermodynamics, and chemical reactions in laser-produced plas- mas are of general interest for all laser ablation applications. This study investigates the complex morphology and behavior of reactive species in nanosecond laser-produced uranium plasmas. Comparing plasma morphology in various inert and reactive ambient gases provides information about the role of gas-phase chemistry in plume hydrodynamics. Background gases including nitrogen and argon foster collisional interactions leading to more signicant plume connement and the increase in persistence of uranium species. On the other hand, environments containing reactive gases such as oxygen promote chemical reactions between the plasma and ambient species. By comparing the expansion dynamics of uranium plumes in nitrogen, air, and argon, we discover that chemical reactions modify the hydrodynamics of the plume at later times of its evolution in the air background. Furthermore, we observe that varying the concentration of oxygen in the ll gas promotes dierent reaction path- ways that lead to the formation of uranium oxides. The reaction pathways from atoms to diatomic to polyatomic molecules strongly vary with ambient oxygen concentration. Lower oxygen concentrations enhance the formation of uranium monoxide from atomic uranium, whereas higher oxygen concentrations tend to depopulate both atomic uranium andmore » uranium monoxide concentrations through formation of more complex uranium oxides.« less

Authors:
 [1];  [1];  [2];  [3];  [4];  [3]; ORCiD logo [3]
  1. UNIVERSITY OF MICHIGAN
  2. University of Michigan
  3. BATTELLE (PACIFIC NW LAB)
  4. Opticslah, Inc.
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1576466
Report Number(s):
PNNL-SA-140404
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 8
Country of Publication:
United States
Language:
English
Subject:
(140.3440) Laser-induced breakdown, (280.4788) Optical Sensing, (280.5395) Plasma Diagnostics, (300.2140) Emission Spectroscopy, 2D fast imaging

Citation Formats

Skrodzki, Patrick J., Burger, Milos, Jovanovic, I, Phillips, Mark C., Yeak, Jeremy, Brumfield, Brian E., and Harilal, Sivanandan S. Plume Dynamics and Gas-phase Molecular Formation in Transient Laser-produced Uranium Plasmas. United States: N. p., 2019. Web. doi:10.1063/1.5087704.
Skrodzki, Patrick J., Burger, Milos, Jovanovic, I, Phillips, Mark C., Yeak, Jeremy, Brumfield, Brian E., & Harilal, Sivanandan S. Plume Dynamics and Gas-phase Molecular Formation in Transient Laser-produced Uranium Plasmas. United States. doi:10.1063/1.5087704.
Skrodzki, Patrick J., Burger, Milos, Jovanovic, I, Phillips, Mark C., Yeak, Jeremy, Brumfield, Brian E., and Harilal, Sivanandan S. Thu . "Plume Dynamics and Gas-phase Molecular Formation in Transient Laser-produced Uranium Plasmas". United States. doi:10.1063/1.5087704.
@article{osti_1576466,
title = {Plume Dynamics and Gas-phase Molecular Formation in Transient Laser-produced Uranium Plasmas},
author = {Skrodzki, Patrick J. and Burger, Milos and Jovanovic, I and Phillips, Mark C. and Yeak, Jeremy and Brumfield, Brian E. and Harilal, Sivanandan S.},
abstractNote = {The dynamics of expansion, thermodynamics, and chemical reactions in laser-produced plas- mas are of general interest for all laser ablation applications. This study investigates the complex morphology and behavior of reactive species in nanosecond laser-produced uranium plasmas. Comparing plasma morphology in various inert and reactive ambient gases provides information about the role of gas-phase chemistry in plume hydrodynamics. Background gases including nitrogen and argon foster collisional interactions leading to more signicant plume connement and the increase in persistence of uranium species. On the other hand, environments containing reactive gases such as oxygen promote chemical reactions between the plasma and ambient species. By comparing the expansion dynamics of uranium plumes in nitrogen, air, and argon, we discover that chemical reactions modify the hydrodynamics of the plume at later times of its evolution in the air background. Furthermore, we observe that varying the concentration of oxygen in the ll gas promotes dierent reaction path- ways that lead to the formation of uranium oxides. The reaction pathways from atoms to diatomic to polyatomic molecules strongly vary with ambient oxygen concentration. Lower oxygen concentrations enhance the formation of uranium monoxide from atomic uranium, whereas higher oxygen concentrations tend to depopulate both atomic uranium and uranium monoxide concentrations through formation of more complex uranium oxides.},
doi = {10.1063/1.5087704},
journal = {Physics of Plasmas},
number = 8,
volume = 26,
place = {United States},
year = {2019},
month = {8}
}

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