Analysis of relaxing laser-induced plasmas by absorption spectroscopy: Toward a new quantitative diagnostic technique

Ribière, M.; Chéron, B. G.

doi:10.1016/j.sab.2010.05.009

Cited by 27 publications

(22 citation statements)

References 32 publications

(53 reference statements)

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“…Absorption (solid line) and emission (dashed line) spectra are dominated by Cu I lines at 324.7 and 327.4 nm in the 320 to 330 nm spectral range. This agrees with previously published data [18]. Outside this range, two Cu I lines at 329.0 and 330.8 nm and a Cu II line at 331.5 nm are detectable in emission but not in absorption.…”

Section: Resultssupporting

confidence: 93%

“…Besides, new lines appear in the absorption spectra that are not present in the emission spectra, peaking at 383.5, 384.0, 393.6, and 406.5 nm. It is worth noting that these additional lines are absent in the previously published absorption spectra of Al plasma [18]. , multiple emission (dashed trace) and absorption (solid trace) lines appear, but their fine structure is slightly different.…”

Section: Resultsmentioning

confidence: 76%

“…It appears that only limited information on this subject is available. Recent works [12,17,18] were accomplished by using the dual laser configuration to study LIP absorption spectra in the NUV-VIS spectral range. These studies suggested potential analytical applications and even the possibility of calibration-free analysis.…”

Section: Introductionmentioning

confidence: 99%

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Fraunhofer-type absorption lines in double-pulse laser-induced plasma

Nagli¹,

Gaft²,

Gornushkin

2012

Appl. Opt.

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We studied the confocal double-pulse laser-induced plasma in the very beginning of its life. It was found that the second laser pulse fired 0.7 to 5 µs after the first pulse produces plasma which, during the first 0 to 20 ns, resembles solar configuration. There is a very hot and compact plasma core that radiates a broad continuum spectrum and a much larger and cooler outer shell. The light from the hot core passes through the cold outer shell and is partly absorbed by atoms and ions that are in ground (or close to ground) states. This produces absorption lines that are similar to Fraunhofer lines observed in the sun spectrum. The possibility to use these absorption lines for new direct and calibration free laser-induced breakdown spectroscopy analytical applications, both in laboratory and industrial conditions, is proved.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 76%

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Fraunhofer-type absorption lines in double-pulse laser-induced plasma

Nagli¹,

Gaft²,

Gornushkin

2012

Appl. Opt.

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“…The authors reported spatially resolved absolute number densities of species and were able to follow their temporal evolution during the plasma expansion. 232 The most important advantage of laser absorption methods is that they do not require LTE assumption to provide absolute number densities: this is different from an absolute emission measurement, which relies upon LTE. The knowledge of the absorption oscillator strength, however, is still required.…”

Section: 112mentioning

confidence: 99%

Laser-Induced Breakdown Spectroscopy (LIBS), Part I: Review of Basic Diagnostics and Plasma—Particle Interactions: Still-Challenging Issues within the Analytical Plasma Community

2010

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Laser-induced breakdown spectroscopy (LIBS) has become a very popular analytical method in the last decade in view of some of its unique features such as applicability to any type of sample, practically no sample preparation, remote sensing capability, and speed of analysis. The technique has a remarkably wide applicability in many fields, and the number of applications is still growing. From an analytical point of view, the quantitative aspects of LIBS may be considered its Achilles' heel, first due to the complex nature of the laser–sample interaction processes, which depend upon both the laser characteristics and the sample material properties, and second due to the plasma–particle interaction processes, which are space and time dependent. Together, these may cause undesirable matrix effects. Ways of alleviating these problems rely upon the description of the plasma excitation-ionization processes through the use of classical equilibrium relations and therefore on the assumption that the laser-induced plasma is in local thermodynamic equilibrium (LTE). Even in this case, the transient nature of the plasma and its spatial inhomogeneity need to be considered and overcome in order to justify the theoretical assumptions made. This first article focuses on the basic diagnostics aspects and presents a review of the past and recent LIBS literature pertinent to this topic. Previous research on non-laser-based plasma literature, and the resulting knowledge, is also emphasized. The aim is, on one hand, to make the readers aware of such knowledge and on the other hand to trigger the interest of the LIBS community, as well as the larger analytical plasma community, in attempting some diagnostic approaches that have not yet been fully exploited in LIBS.

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“…The observed atomic absorption lines were associated with cool outer parts of the plasma and were called Fraunhofer lines [8]. Ribière and co-workers investigated LIP absorption in the NIR UV-VIS spectral range [9,10] using a dual-pulse photoabsorption method [11,12], with two laser pulses separated in space and time. Recently, we detected Fraunhofer-type absorption lines in double-pulse laser-induced plasma (DP-LIP) of pure metals, alloys and minerals, with the second laser pulse delayed by several microseconds after the first laser pulse.…”

Section: Introductionmentioning

confidence: 99%