David Weisz
Lawrence Livermore National Laboratory
18 Papers
David Weisz is an academic researcher from Lawrence Livermore National Laboratory. The author has contributed to research in topics: Chemistry & Laser ablation. The author has an hindex of 7, co-authored 13 publications. Previous affiliations of David Weisz include University of California, Berkeley.
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Papers
A model of early formation of uranium molecular oxides in laser-ablated plasmas
Mikhail Finko,Davide Curreli,David Weisz,Jonathan C. Crowhurst,Timothy P. Rose,Batikan Koroglu,Harry B. Radousky,Michael R. Armstrong +7 more
Abstract: In this work, we present a newly constructed UxOy reaction mechanism that consists of 30 reaction channels (21 of which are reversible channels) for 11 uranium molecular species (including ions). Both the selection of reaction channels and calculation of corresponding rate coefficients is accomplished via a comprehensive literature review and application of basic reaction rate theory. The reaction mechanism is supplemented by a detailed description of oxygen plasma chemistry (19 species and 142 reaction channels) and is used to model an atmospheric laser ablated uranium plume via a 0D (global) model. The global model is used to analyze the evolution of key uranium molecular species predicted by the reaction mechanism, and the initial stage of formation of uranium oxide species.
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Optical spectroscopy and modeling of uranium gas-phase oxidation: Progress and perspectives
Elizabeth J. Kautz,Emily N. Weerakkody,Mikhail Finko,Mikhail Finko,Davide Curreli,Batikan Koroglu,Timothy P. Rose,David Weisz,Jonathan C. Crowhurst,Harry B. Radousky,Michael DeMagistris,Neeraj Sinha,Deborah A. Levin,Ed L. Dreizin,Mark C. Phillips,Nick G Glumac,Sivanandan S. Harilal +16 more
TL;DR: In this article, the current understanding and challenges related to studying U plasma chemistry, specifically U gas-phase oxidation and molecular formation, via optical spectroscopy of plasmas and associated computational and spectral modeling are discussed.
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Formation of 238U16O and 238U18O observed by time-resolved emission spectroscopy subsequent to laser ablation
David Weisz,Jonathan C. Crowhurst,Wigbert J. Siekhaus,Timothy P. Rose,Batikan Koroglu,Harry B. Radousky,Joseph M. Zaug,Michael R. Armstrong,Brett H. Isselhardt,Michael R. Savina,Magdi Naim Azer,Mikhail Finko,Davide Curreli +12 more
TL;DR: In this article, the vibronic emission spectra of an oxide of uranium formed after laser ablation of the metal in gaseous oxygen were measured and the time-dependent relative intensity of a band located at approximately 593.6 nm in 16O2 was determined.
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Gas Phase Chemical Evolution of Uranium, Aluminum, and Iron Oxides
Batikan Koroglu,Scott W. Wagnon,Z. Dai,Jonathan C. Crowhurst,Michael R. Armstrong,David Weisz,Marco Mehl,Marco Mehl,Joseph M. Zaug,Harry B. Radousky,Timothy P. Rose +10 more
TL;DR: This work shows the nucleation and growth of metal oxide particles in rapidly-cooling gas is closely coupled to the kinetically-controlled chemical pathways for vapor-phase oxide formation.
Effects of Plume Hydrodynamics and Oxidation on the Composition of a Condensing Laser-Induced Plasma
David Weisz,Jonathan C. Crowhurst,Mikhail Finko,Timothy P. Rose,Batikan Koroglu,Reto Trappitsch,Harry B. Radousky,Wigbert J. Siekhaus,Michael R. Armstrong,Brett H. Isselhardt,Magdi Naim Azer,Davide Curreli +11 more
TL;DR: It is illustrated that the formation sequence of these oxides subsequent to ablation is predictable to first order, and that ZrO formed more readily at early times, volumetrically in the plume, while SrO formed later in time, around the periphery.
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