Investigation of laser ablation plume dynamics by high-resolution time-resolved atomic absorption spectroscopy

Bushaw, Bruce A.; Alexander, M. L.

doi:10.1016/s0169-4332(97)00769-1

Cited by 21 publications

(12 citation statements)

References 8 publications

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“…[1][2][3][4]. Popular LA spectrometric techniques include LA-inductively coupled plasma-mass spectrometry (LA-ICP-MS) [5][6][7], LA-laser absorption spectroscopy (LA-LAS) [2,[8][9][10], LA-optical emission spectroscopy (LA-OES, commonly called laser-induced breakdown spectroscopy or LIBS) [1,11], and LA-laser induced fluorescence (LA-LIF) [12]. Such analytical techniques provide elemental and isotopic information about target materials.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…It must be mentioned that the absorption spectral features may get distorted at early times of plasma evolution due to inhomogeneities in the plasma. As an extreme example, at low background pressure conditions and at early times during the LPP evolution, Doppler splitting may be observed in the spectral absorption profiles of lines because of the counter-propagating velocity distributions of atoms or ions along the probe laser line of sight (Bushaw and Alexander, 1998;Miyabe et al, 2012). Fig.…”

Section: Laser Absorption Spectroscopymentioning

confidence: 99%

“…Fig. 21 shows contour maps of the time-resolved absorption of neutral Sr atoms formed in the ablation of CaCO 3 , which shows Doppler splitting (Bushaw and Alexander, 1998). Although most distinct at low pressures and giving rise to a dual-peaked absorption profile, similar effects of non-thermal atomic/ionic distributions may be present at early times for higher pressures as well, which may distort the absorption lineshape from a simple Voigt profile.…”

Section: Laser Absorption Spectroscopymentioning

confidence: 99%

Optical diagnostics of laser-produced plasmas

Harilal,

Phillips,

Froula

et al. 2022

Preprint

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Laser-produced plasmas (LPPs) engulf exotic and complex conditions ranging in temperature, density, pressure, magnetic and electric fields, charge states, charged particle kinetics, and gas-phase reactions, based on the irradiation conditions, target geometries, and the background cover gas. The application potential of the LPP is so diverse that it generates considerable interest for both basic and applied research areas. The fundamental research on LPPs can be traced back to the early 1960s, immediately after the invention of the laser. In the 1970s, the laser was identified as a tool to pursue inertial confinement fusion, and since then, several other technologies emerged out of LPPs. These applications prompted the development and adaptation of innovative diagnostic tools for understanding the fundamental nature and spatiotemporal properties of these complex systems. Although most of the traditional characterization techniques developed for other plasma sources can be used to characterize the LPPs, care must be taken to interpret the results because of their small size, transient nature, and inhomogeneities. The existence of the large spatiotemporal density and temperature gradients often necessitates non-uniform weighted averaging over distance and time. Among the various plasma characterization tools, optical-based diagnostic tools play a key role in the accurate measurements of LPP parameters. The optical toolbox contains optical probing methods (Thomson scattering, shadowgraphy, Schlieren, interferometry, velocimetry, and deflectometry), optical spectroscopy (emission, absorption, and fluorescence), and passive and active imaging. Each technique is useful for measuring a specific property, and its use is limited to a certain time span during the LPP evolution because of the sensitivity issues related to the selected measuring tool. Therefore, multiple diagnostic tools are essential for a comprehensive insight into the entire plasma behavior. In recent times, the improvements in performance in the lasers and detector systems expanded the capability of the aforementioned passive and active diagnostics tools. This review provides an overview of optical diagnostic tools frequently employed for the characterization of the LPPs and emphasizes techniques, associated assumptions, and challenges.

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“…Resonant LAS is a straightforward method to characterize laser ablation [19][20][21][22]. Starting from a basic model to describe the molecular ablation plume, in this section we discuss the time-and frequency-resolved LAS signals to characterize the physical properties of the molecular yield and study its internal energy spectra.…”

Section: Modeling Absorption Spectroscopy With Ablated Moleculesmentioning

confidence: 99%

BaH molecular spectroscopy with relevance to laser cooling

2016

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We describe a simple experimental apparatus for laser ablation of barium monohydride (BaH) molecules and the study of their rovibrational spectra that are relevant to direct laser cooling. We present a detailed analysis of the properties of ablation plumes that can improve the understanding of surface ablation and deposition technologies. A range of absorption spectroscopy and collisional thermalization regimes has been studied. We directly measured the Franck-Condon factor of the B 2 Σ + (v = 0) ← X 2 Σ + (v = 1) transition. Prospects for production of a high luminosity cryogenic BaH beam are outlined. This molecule is a promising candidate for laser cooling and ultracold fragmentation, both of which are precursors to novel experiments in many-body physics and precision measurement.

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Investigation of laser ablation plume dynamics by high-resolution time-resolved atomic absorption spectroscopy

Cited by 21 publications

References 8 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

Optical diagnostics of laser-produced plasmas

BaH molecular spectroscopy with relevance to laser cooling

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