Influence of Ambient Gas on Laser-Induced Breakdown Spectroscopy of Uranium Metal

Zhang, Dacheng; Ma, Xueli; Wang, Shulong; Zhu, Xiwen

doi:10.1088/1009-0630/17/11/15

Cited by 29 publications

(21 citation statements)

References 21 publications

(16 reference statements)

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“…While the experimental conditions in an LPP are different from those of the low-pressure flow reactor, there has been one reported detection of UO emission from a LIBS study that supports the assertion that an excess of O 2 significantly reduces the number density of UO [34]. In that study, U metal was ablated in air and pure O 2 , and when the ablation was performed in a pure O 2 ambient background there was a significant reduction in the UO emission intensity compared to in air [34]. Unlike the LIBS study employing U metal, where an emission feature of UO x was evident, the U-doped glass target contains ~1% U by mass.…”

Section: Investigation Of U Oxide Formation In Lppmentioning

confidence: 88%

“…LA-LAS shows significant differences in U signal and persistence between air and N 2 at identical pressures. The abundance of reactive species such as O 2 in air may be responsible for quenching the U signal due to the formation of U oxides, reducing the atomic U concentration in the LPP [34]. Consequently, further investigation with emission spectroscopic methods yields probable mechanisms for the U signal and persistence reduction between ambient gases.…”

Section: Optical Emission Spectroscopymentioning

confidence: 99%

“…To study uranium oxide formation, emission spectra over a 590 -600 nm spectral range were recorded with the ambient air pressure at 4 or 750 Torr. The selection of this spectral range is based on reported uranium oxide electronic band centers from multiple literature sources [34,42,43]. A typical spectrum obtained from U in a glass matrix is given in Figure 8.…”

Section: Investigation Of U Oxide Formation In Lppmentioning

confidence: 99%

See 2 more Smart Citations

Significance of ambient conditions in uranium absorption and emission features of laser ablation plasmas

Skrodzki

Shah

Taylor

et al. 2016

Spectrochimica Acta Part B: Atomic Spectroscopy

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This study employs laser ablation (LA) to investigate mechanisms for U optical signal variation under various environmental conditions during laser absorption spectroscopy (LAS) and optical emission spectroscopy (OES). Potential explored mechanisms for signal quenching related to ambient conditions include plasma chemistry (e.g., uranium oxide formation), ambient gas confinement effects, and other collisional interactions between plasma constituents and the ambient gas. LA-LAS studies show that the persistence of the U ground state population is significantly reduced in the presence of air ambient compared to nitrogen. LA-OES yields congested spectra from which the U I 356.18 nm transition is prominent and serves as the basis for signal tracking. LA-OES signal and persistence vary negligibly between the test gases (air and N 2 ), unlike the LA-LAS results. The plume hydrodynamic features and plume fundamental properties showed similar results in both air and nitrogen ambient. Investigation of U oxide formation in the laser-produced plasma suggests that low U concentration in a sample hinders consistent detection of UO molecular spectra.

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Section: Investigation Of U Oxide Formation In Lppmentioning

confidence: 88%

Section: Optical Emission Spectroscopymentioning

confidence: 99%

Section: Investigation Of U Oxide Formation In Lppmentioning

confidence: 99%

See 1 more Smart Citation

Significance of ambient conditions in uranium absorption and emission features of laser ablation plasmas

Skrodzki

Shah

Taylor

et al. 2016

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…This rising trend for plasma background at 3 and 5 s is a result of a pseudo-continuum from the strongly overlapping UO molecular bands. Previous studies [38,39]…”

Section: Identification Of U Atomic and Molecular Spectral Featuresmentioning

confidence: 99%

Combination of atomic lines and molecular bands for uranium optical isotopic analysis in laser induced plasma spectrometry

Mao

Chan

Choi

et al. 2017

J Radioanal Nucl Chem

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“…Characterization of a U plasma using high laser power can provide useful nuclear forensic information: Isotope ratio characterization, and quantitative and qualitative analysis of radioactive samples. These signatures have been studied using LAICP-MS and LIBS techniques [159][160][161] , however, these approaches do not probe the conditions of the expanding plume directly. In the present study, we extracted the plume through small apertures to gain direct access to the conditions in the plasma.…”

Section: Introductionmentioning

confidence: 99%

Coulomb explosions dynamics

Alavi¹

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Chemical reaction dynamics studies emerged with the advent of quantum mechanical theories in 1920s which have the capability of predicting the atomic motions by calculating potential energy surfaces. Experimental studies in this field began to flourish with the advances in molecular beam generation and laser beam technologies many years later leading to the Nobel prize awarded to Herschbach, Lee, and Polanyi in 1986. Later in 1980s, advances in the production of frequency tunable ultrashort laser pulses with the temporal resolution of femtoseconds led to the birth of the field of femto-chemistry which is the study of molecular dynamics in real time. In the last few decades, various spectroscopic techniques exploiting ultrashort laser pulses have been developed to study the non-adiabatic dynamics of molecules in real time and space. Laser-induced Coulomb Explosion Imaging (CEI) is a powerful probe technique now emerging in this field, to unravel the structural changes of molecular systems in real time. Extracting structural information from CEI requires imaging of multiple fragments at each experimental cycle which allows us to obtain their relative velocity distribution. In this work, we successfully coupled a three-dimensional multi-mass coincidence detection technique with CEI to study the dissociation dynamics of complicated polyatomic molecules. Covariance imaging, which is a statistical technique yielding correlated information, was used to find the related momenta of various pairs of ions and reveal different dissociation channels of the parent multi-cation. Using the combination of these techniques, the strong field dissociative ionization of chlorocarbonylsulfenyl chloride (CCSC) and methoxycarbonylsulfenyl chloride (MCSC) (belonging to thioester family) were studied. The ultrafast electron diffraction (UED) technique is a complementary method to ultrafast laser spectroscopy, capable of directly resolving the electronic and nuclear dynamics in real time and space due to sensitivity to the spatial atomic distribution in the system. MeV UED facility is a newly developed apparatus at the SLAC National Accelerator Laboratory offering femtosecond time resolution and sub-Angstrom spatial resolution in the study of gas phase molecular systems. Using this facility, we performed a time-resolved UED experiment to study the UV photodissociation of oxalyl chloride. Previous theoretical and experimental studies have suggested non-consistent results for the UV dissociation of this molecule which results in four fragments upon absorption a single photon. Here, with the initial analysis of diffraction images, and comparison with the theory, we confirmed a concerted four-body dissociation channel as the main mechanism.

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Influence of Ambient Gas on Laser-Induced Breakdown Spectroscopy of Uranium Metal

Cited by 29 publications

References 21 publications

Significance of ambient conditions in uranium absorption and emission features of laser ablation plasmas

Significance of ambient conditions in uranium absorption and emission features of laser ablation plasmas

Combination of atomic lines and molecular bands for uranium optical isotopic analysis in laser induced plasma spectrometry

Coulomb explosions dynamics

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