Enhancement of Aluminum, Titanium, and Iron in Glass Using Pre-Ablation Spark Dual-Pulse LIBS

Stratis, Dimitra N.; Eland, Kristine L.; Angel, S. M.

doi:10.1366/0003702001948871

Cited by 99 publications

(61 citation statements)

References 31 publications

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“…However, one of its major drawbacks is its low sensitivity, which seriously hinders further improving the limit of detection (LOD) and restricts the further development and application of LIBS. To enhance the LIBS sensitivity, ultrashort-pulse and dual-pulse LIBS have been developed in recent years [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of optical emission from laser-induced plasmas by combined spatial and magnetic confinement

Guo¹,

Wei²,

Zhang³

et al. 2011

Opt. Express

113

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He, X. N.; Li, C. M.; Zhou, Y. S.; Cai, Z. X.; Zeng, X. Y.; and Lu, Yongfeng, "Enhancement of optical emission from laser-induced plasmas by combined spatial and magnetic confinement" (2011 Abstract: To enhance optical emission in laser-induced breakdown spectroscopy, both a pair of permanent magnets and an aluminum hemispherical cavity (diameter: 11.1 mm) were used simultaneously to magnetically and spatially confine plasmas produced by a KrF excimer laser in air from pure metal and alloyed samples. High enhancement factors of about 22 and 24 in the emission intensity of Co and Cr lines were acquired at a laser fluence of 6.2 J/cm 2 using the combined confinement, while enhancement factors of only about 11 and 12 were obtained just with a cavity. The mechanism of enhanced optical emission by combined confinement, including shock wave in the presence of a magnetic field, is discussed. The Si plasmas, however, were not influenced by the presence of magnets as Si is hard to ablate and ionize and hence has less free electrons and positive ions. Images of the laser-induced Cr and Si plasmas show the difference between pure metallic and semiconductor materials in the presence of both a cavity and magnets.

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Section: Introductionmentioning

confidence: 99%

Enhancement of optical emission from laser-induced plasmas by combined spatial and magnetic confinement

Guo¹,

Wei²,

Zhang³

et al. 2011

Opt. Express

113

View full text Add to dashboard Cite

show abstract

“…In the orthogonal configuration, the second pulse does not ablate more material, but reheats the plasma and reexcites the material ablated by the first pulse. Other authors have given reasons for the signal enhancement on preheating orthogonal configurations, such as a reduction in density or pressure of the surrounding media due to the first pulse [35,[37][38][39].…”

Section: Sequences Of Pulses: Double Pulse Libsmentioning

confidence: 99%

Laser-Induced Breakdown Spectroscopy: Fundamentals, Applications, and Challenges

2012

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Laser-induced breakdown spectroscopy (LIBS) is a technique that provides an accurate in situ quantitative chemical analysis and, thanks to the developments in new spectral processing algorithms in the last decade, has achieved a promising performance as a quantitative chemical analyzer at the atomic level. These possibilities along with the fact that little or no sample preparation is necessary have expanded the application fields of LIBS. In this paper, we review the state of the art of this technique, its fundamentals, algorithms for quantitative analysis or sample classification, future challenges, and new application fields where LIBS can solve real problems.

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“…Improvements in the figures of merit by double-laser pulse configurations have contributed to better sensitivity and gain signal for LIBS analyses [24,25]. Several double-pulse geometric configuration approaches have been used consisting of either one laser [26], or two different lasers [27] to encompass a double-pulse LIBS setup.…”

Section: Double-pulse Libsmentioning

confidence: 99%

Wavelength Dependence on the Forensic Analysis of Glass by Laser Induced Breakdown Spectroscopy

Cahoon¹,

Almirall²

2009

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Laser Induced Breakdown Spectroscopy (LIBS) can be used for the chemical characterization of glass to provide evidence of an association between a fragment found at a crime scene to a source of glass of known origin. Two different laser irradiances, 266 nm and 1064 nm, were used to conduct qualitative and quantitative analysis of glass standards. Single-pulse and double-pulse configurations and lens-to-sample-distance (LTSD) settings were optimized to yield the best laser-glass coupling. Laser energy and acquisition timing delays were also optimized to ABSTRACTLaser Induced Breakdown Spectroscopy (LIBS) can be used for the chemical characterization of glass to provide evidence of an association between a fragment found at a crime scene to a source of glass of known origin. Two different laser irradiances, 266 nm and 1064 nm, were used to conduct qualitative and quantitative analysis of glass standards. Single-pulse and double-pulse configurations and lens-to-sample-distance (LTSD) settings were optimized to yield the best laser-glass coupling. Laser energy and acquisition timing delays were also optimized to result in the highest signal to noise ratio. The crater morphology was examined and the mass removed was calculated for both the 266 nm and 1064nm irradiations. The analytical figures of merit suggest that the 266 nm and 1064 nm wavelengths are capable of good performance for the forensic chemical characterization of glass. The results presented here suggest that the 266 nm laser produces a better laser-glass matrix coupling resulting in a better stoichiometric representation of the glass sample. The 266 nm irradiance is therefore recommended for the forensic analysis and comparison of glass samples.

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Enhancement of Aluminum, Titanium, and Iron in Glass Using Pre-Ablation Spark Dual-Pulse LIBS

Cited by 99 publications

References 31 publications

Enhancement of optical emission from laser-induced plasmas by combined spatial and magnetic confinement

Enhancement of optical emission from laser-induced plasmas by combined spatial and magnetic confinement

Laser-Induced Breakdown Spectroscopy: Fundamentals, Applications, and Challenges

Wavelength Dependence on the Forensic Analysis of Glass by Laser Induced Breakdown Spectroscopy

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