Influence of ambient gas pressure on laser-induced breakdown spectroscopy technique in the parallel double-pulse configuration

Cristoforetti, G.; Legnaioli, Stefano; Palleschi, Vincenzo; Salvetti, A.; Tognoni, E.

doi:10.1016/j.sab.2004.09.003

Cited by 145 publications

(74 citation statements)

References 34 publications

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“…shielding for the ablation pulse [29,30]. Higher sensitivity was also evident in the double pulse pre-spark configuration, than when compared to all other experimental data, due to the resolution of emission line Ti II 336.12 nm.…”

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confidence: 58%

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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confidence: 58%

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

Cahoon¹,

Almirall²

2009

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“…Lower gas pressure can lead to a shift toward smaller particle size distributions of ablated aerosol [36][37][38] and therefore it is natural to consider that stability of the signal intensity could be improved. To test this, signal intensity profiles were obtained from a metallic sample using the present low gas-pressure cell.…”

Section: Signal Intensity Profilementioning

confidence: 99%

“…The effect of the gas pressure in the sample cell onto the data was well studied in laserinduced breakdown spectroscopy (LIBS) and enhancement of the signal intensity could be achieved by laser ablation under low-pressure conditions. 35 The gain in the signal intensity in LIBS is basically explained by better plasma expansion due to low local pressure, 36,37 or by a shift toward a smaller particle size distribution of ablated particles. 23 Moreover, the level of sample re-deposition after ablation can be reduced by laser ablation under low gas-pressure conditions.…”

Section: Introductionmentioning

confidence: 99%

Development of an On-line Low Gas Pressure Cell for Laser Ablation-ICP-Mass Spectrometry

Hirata

2007

ANAL. SCI.

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“…recently in Refs. [1][2][3][4][5][6][7][8]. A significant number of experimental studies have been dedicated to the investigation of the Ar I total Stark full-width at half-intensity maximum (FWHM) (W t ) and total Stark shift (d t ) of the 751.465 nm, 763.511 nm and 772.376 nm spectral lines from 4s-4p transition and 696.543 nm, 727.294 nm, 706.722 nm and 738.398 nm spectral lines from 4s -4pV transition.…”

Section: Introductionmentioning

confidence: 99%

Measured Stark widths and shifts of the neutral argon spectral lines in 4s–4p and 4s–4p′ transitions

Milosavljević

Ellingboe

Djeniže

2006

Spectrochimica Acta Part B: Atomic Spectroscopy

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Influence of ambient gas pressure on laser-induced breakdown spectroscopy technique in the parallel double-pulse configuration

Cited by 145 publications

References 34 publications

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

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

Development of an On-line Low Gas Pressure Cell for Laser Ablation-ICP-Mass Spectrometry

Measured Stark widths and shifts of the neutral argon spectral lines in 4s–4p and 4s–4p′ transitions

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