Material: Gold

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2 articles found

Analytical Analysis of Different Karats of Gold Using Laser Induced Breakdown Spectroscopy(LIBS) and Laser Ablation Time of Flight Mass Spectrometer (LA-TOF-MS)

Author: Ahmed, N. ; et. al.

Journal: Plasma Chemistry and Plasma Processing (2018)

Applications

DOI: 10.1007/s11090-017-9862-2

Authors
Ahmed, R. ; Baig, M. A.

Keywords

LIBS; Karats of gold; Elemental composition; Plasma parameters; LA-TOF-mass spectrometry;ELEMENTAL ANALYSIS; OSCILLATOR-STRENGTHS; INDUCED PLASMA; ALLOYS; TRANSITIONS; LIFETIMES; LITHIUM; SAMPLES; LINES

Abstract

Laser induced breakdown spectroscopy (LIBS) coupled with a laser ablation time of flight mass spectrometer (LA-TOF-MS) has been developed for discrimination/analysis of the precious gold alloys cartage. Five gold alloys of Karats 18K, 19K, 20K, 22K and 24K having certified composition of gold as 75, 79, 85, 93 and 99.99% were tested and their precise elemental compositions were determined using the laser produced plasma technique. The plasma was generated by focusing beam of a Nd:YAG laser on the target in air and its time integrated emission spectra were registered in the range 250-870 nm. The calibration free LIBS technique (CF-LIBS) was used for the quantitative determination of the constituent elements present in different Karats of gold. Elemental compositions of these gold alloys were also determined using a Laser Ablation time of flight mass spectrometer (LA-TOF-MS). The LIBS limit of detection was calculated from the calibration curves for copper, silver and gold. Results of CF-LIBS and LA-TOF-MS are in excellent agreement with the certified values. It is demonstrated that LIBS coupled with LA-TOF-MS is an efficient technique that can be used to analyze any precious alloys in a fraction of a second.

Area:

Industry

Material:

Gold

Elements:

Lines [nm]:

Cu I 261.84 nm Cu I 282.44 nm Cu I 293.31 nm Cu I 296.12 nm Cu I 299.74 nm Cu I 324.75 nm Cu I 327.40 nm Cu I 330.79 nm Cu I 465.11 nm Cu I 510.55 nm Cu I 515.32 nm Cu I 521.82 nm Cu I 529.25 nm Cu I 570.02 nm Cu I 578.21 nm Cu I 809.26 nm

Lines [nm]:

Au I 264.15 nm Au I 267.60 nm Au I 268.87 nm Au I 270.09 nm Au I 274.83 nm Au I 288.35 nm Au I 302.92 nm Au I 312.28 nm Au I 322.53 nm Au I 406.51 nm Au I 479.26 nm Au I 481.16 nm Au I 523.03 nm Au I 583.74 nm Au I 627.82 nm Au I 751.07 nm

Lines [nm]:

Ag I 328.07 nm Ag I 520.91 nm Ag I 546.55 nm Ag II 250.71 nm Ag II 266.04 nm Ag II 276.75 nm Ag II 283.76 nm Ag II 289.63 nm Ag II 795.73 nm

Lines [nm]:

N I 742.36 nm N I 744.23 nm N I 746.83 nm N I 818.49 nm N I 821.63 nm N I 868.03 nm

Lines [nm]:

O I 777.19 nm O I 777.42 nm O I 777.54 nm O I 844.62 nm O I 844.64 nm O I 844.68 nm

...

Emmision lines:
Ag II 250.71 nm
Cu I 261.84 nm
Au I 264.15 nm
Ag II 266.04 nm
Au I 267.60 nm
Au I 268.87 nm
Au I 270.09 nm
Au I 274.83 nm
Ag II 276.75 nm
Cu I 282.44 nm
Ag II 283.76 nm
Au I 288.35 nm
Ag II 289.63 nm
Cu I 293.31 nm
Cu I 296.12 nm
Cu I 299.74 nm
Au I 302.92 nm
Au I 312.28 nm
Au I 322.53 nm
Cu I 324.75 nm
Cu I 327.40 nm
Ag I 328.07 nm
Cu I 330.79 nm
Au I 406.51 nm
Cu I 465.11 nm
Au I 479.26 nm
Au I 481.16 nm
Cu I 510.55 nm
Cu I 515.32 nm
Ag I 520.91 nm
Cu I 521.82 nm
Au I 523.03 nm
Cu I 529.25 nm
Ag I 546.55 nm
Cu I 570.02 nm
Cu I 578.21 nm
Au I 583.74 nm
Au I 627.82 nm
H I 656.28 nm
N I 742.36 nm
N I 744.23 nm
N I 746.83 nm
Au I 751.07 nm
O I 777.19 nm
O I 777.42 nm
O I 777.54 nm
Ag II 795.73 nm
Cu I 809.26 nm
N I 818.49 nm
N I 821.63 nm
O I 844.62 nm
O I 844.64 nm
O I 844.68 nm
N I 868.03 nm

Emission enhancement of femtosecond laser-induced breakdown spectroscopy by combining nanoparticle and dual-pulse on crystal SiO2

Author: Yang, F. ; et. al.

Journal: Optics & Laser Technology (2017)

Fundamentals

DOI: 10.1016/j.optlastec.2017.03.016

Authors
Cao, Z. T. ; Jiang, L. ; Liu, L. ; Lu, Y. F. ; Wang, M. M. ; Wang, S. M.

Keywords

Femtosecond laser; Laser-induced breakdown spectroscopy; Nanoparticle; Double pulse;FIELD ENHANCEMENT; METALLIC SAMPLES; PLASMA; LIBS; CONFINEMENT; IMPROVEMENT; DISCHARGE; ABLATION; SURFACE; ARRAYS

Abstract

Metal nanoparticle deposition on sample surface is a promising approach to enhance the emission signal during laser-induced breakdown spectroscopy(LIBS). In this article, strong optical emission enhancement was achieved by combining nanoparticle enhanced LIBS (NELIBS) and double pulse LIBS (DP-LIBS) on a crystal SiO2 sample by using femtosecond laser. Thermal dewetting was used to deposit gold (Au) nanoparticles (NPs) on sample surface and NPs with different size were obtained by altering the thickness of the Au film. It was found that both the size and distribution of Au NPs significantly affected the enhancement effect of NELIBS and the Au NPs made from 7.5 nm gold film had the best enhancement effect. The fundamental features of NELIBS enhancement for dielectric target were investigated by studying the photon absorption process. At a low laser fluence of 4.4 J/cm(2), an enhancement factor of about 13 for spectrum intensity was obtained in NELIBS and reached to 30 after being combined with DP-LIBS. (C) 2017 Elsevier Ltd. All rights reserved.

Area:

Nanoparticles enhanced

Material:

Gold ; Nanoparticle ; Silicone dioxide

Elements:

Lines [nm]:

Si I 288.16 nm Si I 243.52 nm Si I 250.69 nm Si I 251.43 nm Si I 251.61 nm Si I 252.85 nm Si I 263.13 nm Si I 390.55 nm

Lines [nm]:

Au I 242.80 nm

Emmision lines:
Au I 242.80 nm
Si I 243.52 nm
Si I 250.69 nm
Si I 251.43 nm
Si I 251.61 nm
Si I 252.85 nm
Si I 263.13 nm
Si I 288.16 nm
Si I 390.55 nm

Material: Gold

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