Three-dimensional analysis of laser induced plasmas in single and double pulse configuration

Corsi, M.; Cristoforetti, G.; Giuffrida, M.; Hidalgo, Montserrat; Legnaioli, Stefano; Palleschi, Vincenzo; Salvetti, A.; Tognoni, E.; Vallebona, Chiara

doi:10.1016/j.sab.2004.02.001

Cited by 155 publications

(92 citation statements)

References 47 publications

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“…This ps laser pulses are employed to produce the fast electron from the laser ablated zircaloy target for further excitation of He by the fast electron bombardment. This two-laser arrangement is different from the conventional double pulse experiments [20][21][22][23][24][25][26][27][28][29][30] where the two lasers are employed for direct ablation and further excitation of the ablated atoms. Although the ps laser is employed to serve the specific role of producing fast electrons from the target, its irradiation on the target will inevitably generate emission from the ablated atoms and the He atoms in the ambient gas near the target surface.…”

Section: Methodsmentioning

confidence: 99%

Signal enhancement of neutral He emission lines by fast electron bombardment of laser-induced He plasma

et al. 2016

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A time-resolved spectroscopic study is performed on the enhancement signals of He gas plasma emission using nanosecond (ns) and picosecond (ps) lasers in an orthogonal configuration. The ns laser is used for the He gas plasma generation and the ps laser is employed for the ejection of fast electrons from a metal target, which serves to excite subsequently the He atoms in the plasma. The study is focused on the most dominant He I 587.6 nm and He I 667.8 nm emission lines suggested to be responsible for the He-assisted excitation (HAE) mechanism. The time-dependent intensity enhancements induced by the fast electrons generated with a series of delayed ps laser ablations are deduced from the intensity time profiles of both He emission lines. The results clearly lead to the conclusion that the metastable excited triplet He atoms are actually the species overwhelmingly produced during the recombination process in the ns laser-induced He gas plasma. These metastable He atoms are believed to serve as the major energy source for the delayed excitation of analyte atoms in ns laser-induced breakdown spectroscopy (LIBS) using He ambient gas.

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Section: Methodsmentioning

confidence: 99%

Signal enhancement of neutral He emission lines by fast electron bombardment of laser-induced He plasma

et al. 2016

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“…The coil was placed 2 mm above the sample's surface. This value has been chosen taking into account previous works [19,25] that analyzed the spatial distribution of the light emission from the plasma plume. The plasma height is typically around 5-10 mm, with a point of maximum emission that evolves in time from the surface up to a distance of a few millimeters in the vertical direction.…”

Section: A Light Capturing Performancementioning

confidence: 99%

“…Plasma emission is usually collected by means of a large-core silica optical fiber coupled with a lens system pointed to the zone where the plasma plume is expected to be [17,18]. This is an efficient system that captures a maximum amount of light from the plasma, but it is difficult to align and its efficiency suffers from fluctuations in the spatial position and shape of the plasma plume [19]. Other approaches that provide spatial integration, such as coaxial capturing through pierce mirrors, add some complexity to the setup [20].…”

Section: Introductionmentioning

confidence: 99%

Normalization of laser-induced breakdown spectroscopy spectra using a plastic optical fiber light collector and acoustic sensor device

et al. 2012

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To estimate the acoustic plasma energy in laser-induced breakdown spectroscopy (LIBS) experiments, a light collecting and acoustic sensing device based on a coil of plastic optical fiber (POF) is proposed. The speckle perturbation induced by the plasma acoustic energy was monitored using a CCD camera placed at the end of a coil of multimode POF and processed with an intraimage contrast ratio method. The results were successfully verified with the acoustic energy measured by a reference microphone. The proposed device is useful for normalizing LIBS spectra, enabling a better estimation of the sample's chemical composition.

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“…In an effort to increase the LIBS sensitivity, double-pulse LIBS excitation is explored. Different laser pulse configurations have contributed to improving the limits of detection (LOD), by increasing the LIBS signal 63,64 . Double-pulse LIBS techniques use a combination of two lasers or two pulses from one laser.…”

Section: Figure 32 Optimization Of Integration Time For Double-pulsementioning

confidence: 99%

“…If LTE is assumed then the electron temperature, T e , can be assumed to be equal to the excitation temperature, T exc [92][93][94] . The Boltzmann equation is used to determine the plasma temperature:…”

mentioning

confidence: 99%

The Discrimination and Association of Float Glass and The Quantitative Analysis of Liquids from Aerosols and Microdrops using Laser Induced Breakdown Spectroscopy

Cahoon¹

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Three-dimensional analysis of laser induced plasmas in single and double pulse configuration

Cited by 155 publications

References 47 publications

Signal enhancement of neutral He emission lines by fast electron bombardment of laser-induced He plasma

Signal enhancement of neutral He emission lines by fast electron bombardment of laser-induced He plasma

Normalization of laser-induced breakdown spectroscopy spectra using a plastic optical fiber light collector and acoustic sensor device

The Discrimination and Association of Float Glass and The Quantitative Analysis of Liquids from Aerosols and Microdrops using Laser Induced Breakdown Spectroscopy

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