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This content will become publicly available on July 17, 2018

Title: Formation of 238U 16O and 238U 18O observed by time-resolved emission spectroscopy subsequent to laser ablation

Here, we have measured vibronic emission spectra of an oxide of uranium formed after laser ablation of the metal in gaseous oxygen. Specifically, we have measured the time-dependent relative intensity of a band located at approximately 593.6 nm in 16O 2. This band grew in intensity relative to neighboring atomic features as a function time in an oxygen environment but was relatively invariant with time in argon. In addition, we have measured the spectral shift of this band in an 18O 2 atmosphere. Based on this shift, and by comparison with earlier results obtained from free-jet expansion and laser excitation, we can confirm that the oxide in question is UO, consistent with recent reports based on laser ablation in 16O 2 only.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [3]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Illinois, Urbana-Champaign, IL (United States). Illinois Applied Research Inst.
  3. Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Nuclear, Plasma, and Radiological Engineering
Publication Date:
Report Number(s):
LLNL-JRNL-729818
Journal ID: ISSN 0003-6951; TRN: US1800682
Grant/Contract Number:
AC52-07NA27344; HDTRA1-16-1-0020
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 111; Journal Issue: 3; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE; Defense Threat Reduction Agency (DTRA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 70 PLASMA PHYSICS AND FUSION; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
OSTI Identifier:
1414346
Alternate Identifier(s):
OSTI ID: 1371790