What can we learn about laser-induced plasmas from Thomson scattering experiments

̧ȩga, K. Dzierże; Mendys, Agata; Pokrzywka, B.

doi:10.1016/j.sab.2014.03.010

Cited by 41 publications

(22 citation statements)

References 35 publications

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“…There has been much prior discussion of the applicability of LTE to LIPs over a range of densities 1 18 20 21 , but as established in our earlier study 11 , LIPs expanding into high vacuum are largely far from LTE. Consequently, the Saha–Boltzmann ionization balance does not apply, and therefore, as mentioned above, a key feature of the present analysis is that the model spectrum is calculated with populations given by a non-LTE generalization of the Saha equation based on a Druyvesteyn (rather than Maxwellian) EEDF.…”

Section: Resultsmentioning

confidence: 76%

“…The absolute values of these plasma parameters are customarily measured using Langmuir probe, Thomson scattering, or laser interferometry diagnostics. As an indirect, invasive technique capable of only limited spatial and temporal resolution, the former is often difficult to apply in practice, while the laser-based methods are preferred as benchmarks but require complex instrumentation and have unintended probe-induced heating effects as a recognized concern 1 2 .…”

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confidence: 99%

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Determination of Stark parameters by cross-calibration in a multi-element laser-induced plasma

Liu

Truscott

Ashfold

2016

Sci Rep

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We illustrate a Stark broadening analysis of the electron density Ne and temperature Te in a laser-induced plasma (LIP), using a model free of assumptions regarding local thermodynamic equilibrium (LTE). The method relies on Stark parameters determined also without assuming LTE, which are often unknown and unavailable in the literature. Here, we demonstrate that the necessary values can be obtained in situ by cross-calibration between the spectral lines of different charge states, and even different elements, given determinations of Ne and Te based on appropriate parameters for at least one observed transition. This approach enables essentially free choice between species on which to base the analysis, extending the range over which these properties can be measured and giving improved access to low-density plasmas out of LTE. Because of the availability of suitable tabulated values for several charge states of both Si and C, the example of a SiC LIP is taken to illustrate the consistency and accuracy of the procedure. The cross-calibrated Stark parameters are at least as reliable as values obtained by other means, offering a straightforward route to extending the literature in this area.

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Section: Resultsmentioning

confidence: 76%

mentioning

confidence: 99%

Determination of Stark parameters by cross-calibration in a multi-element laser-induced plasma

Liu

Truscott

Ashfold

2016

Sci Rep

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“…During the review period several reports of methods to measure the LIBS plasma parameters, including n e and T e , were published. For example, Dzierzega et al 99 described the potential of laser Thomson Scattering (TS) to provide a reliable and direct means of determining plasma n e and T e with high spatial and temporal resolution. Moreover, it was possible to obtain information about the concentration of heavy particles (useful to investigate the propagating shockwaves outside the plasma) and about their temperature (useful to determine the existence of LTE), making use of the Rayleigh light scattering that inherently accompanies TS.…”

Section: Libsmentioning

confidence: 99%

“…Ferritin was tagged with antibody-[Ru(bpy) 3 ] 2+ reporter and antibodybiotin-streptavidin-MNP capture probes. Detection of the [Ru(bpy) 3 ] 2 moiety was then performed by both ECL and IDA-FI-ICP-MS using 99 Ru as the spike. The method was validated by determination of NIBSC 94/572 ferritin reference material at pmol L À1 levels, with between 85 and 95% recovery.…”

Section: Sample Introductionmentioning

confidence: 99%

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

Evans

Pisonero

Smith

et al. 2021

J. Anal. At. Spectrom.

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“…Any investigation of the spectral line profiles, resulting from the emitter-medium interaction, requires the knowledge of the physical properties of this medium which is of paramount importance. In the present study, for LIP diagnostics we used a method completely independent of plasma emission spectra, namely the laser Thomson scattering (TS) [19]. Principal advantages of TS are high spatial and temporal resolutions and ease with which the measured data can be interpreted.…”

Section: Introductionmentioning

confidence: 99%

Study of Stark broadening of Li i 460 and 497 nm spectral lines with independent plasma diagnostics by Thomson scattering

Dzierżęga

Pięta

Zawadzki

et al. 2018

Plasma Sources Sci. Technol.

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We present results of experimental and theoretical studies of the Stark broadening of the LiI 460 nm spectral line with forbidden components and of the isolated 497 nm line. Plasma was induced by Nd:YAG laser radiation at 1064nm with pulse duration ∼4.5ns. Laser-induced plasma was generated in front of the alumina pellet, with some content of Li 2 CO 3 , placed in a vacuum chamber filled with argon under reduced pressure. Plasma diagnostics was performed using the laser Thomson scattering technique, free from assumptions about the plasma equilibrium state and its composition and so independently of plasma emission spectra. Spatially resolved spectra with Li lines were obtained from the measured, laterally integrated ones applying the inverse Abel transform. The Stark profiles were calculated by computer simulation method assuming a plasma in the local thermodynamic equilibrium. Calculations were performed for experimentally-inferred electron densities and temperatures, from 1.422×10 23 to 3.55×10 22 m −3 and from 1.96eV to 1.04eV, respectively. Our studies show very good agreement between experimental Stark profiles and those computer simulated.

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What can we learn about laser-induced plasmas from Thomson scattering experiments

Cited by 41 publications

References 35 publications

Determination of Stark parameters by cross-calibration in a multi-element laser-induced plasma

Determination of Stark parameters by cross-calibration in a multi-element laser-induced plasma

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

Study of Stark broadening of Li i 460 and 497 nm spectral lines with independent plasma diagnostics by Thomson scattering

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