Laser-produced uranium plasma characterization and Stark broadening measurements

M. Burger, P. J. Skrodzki, I. Jovanovic, M. C. Phillips, S. S. Harilal

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

This work reports the spatiotemporal diagnostics of uranium species in plasma plumes produced by nanosecond near-infrared laser pulses in a low-pressure environment. Spatially and temporally resolved emission spectroscopy experiments are combined with the modeling of uranium emission for investigating the dynamics of the plume. The Saha-Eggert equation and Boltzmann plots generated from numerous U I transitions are used to infer temperature. This work also reports the measurements of uranium Stark broadening parameters for U I 499.01 nm and U II 500.82 nm transitions. The Stark widths of select U transitions were measured by comparing their linewidths with the broadening of the O I 777.19 nm line. The electron density was found to be of the order of 1016 cm-3, while the temperature was found to be in the range of 3000-9000 K. In addition to enhancing the fundamental understanding of high-Z plasmas in reduced-pressure environments, the knowledge of Stark broadening parameters could improve the modeling capabilities and analytical performance of techniques that rely on emission plasma spectroscopy.

Original languageEnglish (US)
Article number093103
JournalPhysics of Plasmas
Volume26
Issue number9
DOIs
StatePublished - Sep 1 2019

ASJC Scopus subject areas

  • Condensed Matter Physics

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