Evolution of uranium monoxide in femtosecond laser-induced uranium plasmas

Kyle C. Hartig; Sivanandan S. Harilal; Mark C. Phillips; Brian E. Brumfield; Igor Jovanovic

doi:10.1364/OE.25.011477

Evolution of uranium monoxide in femtosecond laser-induced uranium plasmas

Kyle C. Hartig, Sivanandan S. Harilal, Mark C. Phillips, Brian E. Brumfield, Igor Jovanovic

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

Abstract

We report on the observation of uranium monoxide (UO) emission following fs laser ablation (LA) of a uranium metal sample. The formation and evolution of the molecular emission is studied under various ambient air pressures. Observation of UO emission spectra at a rarefied residual air pressure of ∼1 Torr indicates that the UO molecule is readily formed in the expanding plasma with trace concentrations of oxygen present within the vacuum chamber. The persistence of the UO emission exceeded that of the atomic emission; however, the molecular emission was delayed in time compared to the atomic emission due to the necessary cooling and expansion of the plasma before the UO molecules can form.

Original language	English (US)
Pages (from-to)	11477-11490
Number of pages	14
Journal	Optics Express
Volume	25
Issue number	10
DOIs	https://doi.org/10.1364/OE.25.011477
State	Published - May 15 2017
Externally published	Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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title = "Evolution of uranium monoxide in femtosecond laser-induced uranium plasmas",

abstract = "We report on the observation of uranium monoxide (UO) emission following fs laser ablation (LA) of a uranium metal sample. The formation and evolution of the molecular emission is studied under various ambient air pressures. Observation of UO emission spectra at a rarefied residual air pressure of ∼1 Torr indicates that the UO molecule is readily formed in the expanding plasma with trace concentrations of oxygen present within the vacuum chamber. The persistence of the UO emission exceeded that of the atomic emission; however, the molecular emission was delayed in time compared to the atomic emission due to the necessary cooling and expansion of the plasma before the UO molecules can form.",

author = "Hartig, {Kyle C.} and Harilal, {Sivanandan S.} and Phillips, {Mark C.} and Brumfield, {Brian E.} and Igor Jovanovic",

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AU - Hartig, Kyle C.

AU - Harilal, Sivanandan S.

AU - Phillips, Mark C.

AU - Brumfield, Brian E.

AU - Jovanovic, Igor

PY - 2017/5/15

Y1 - 2017/5/15

N2 - We report on the observation of uranium monoxide (UO) emission following fs laser ablation (LA) of a uranium metal sample. The formation and evolution of the molecular emission is studied under various ambient air pressures. Observation of UO emission spectra at a rarefied residual air pressure of ∼1 Torr indicates that the UO molecule is readily formed in the expanding plasma with trace concentrations of oxygen present within the vacuum chamber. The persistence of the UO emission exceeded that of the atomic emission; however, the molecular emission was delayed in time compared to the atomic emission due to the necessary cooling and expansion of the plasma before the UO molecules can form.

AB - We report on the observation of uranium monoxide (UO) emission following fs laser ablation (LA) of a uranium metal sample. The formation and evolution of the molecular emission is studied under various ambient air pressures. Observation of UO emission spectra at a rarefied residual air pressure of ∼1 Torr indicates that the UO molecule is readily formed in the expanding plasma with trace concentrations of oxygen present within the vacuum chamber. The persistence of the UO emission exceeded that of the atomic emission; however, the molecular emission was delayed in time compared to the atomic emission due to the necessary cooling and expansion of the plasma before the UO molecules can form.

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Evolution of uranium monoxide in femtosecond laser-induced uranium plasmas

Abstract

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