scholarly journals Spatial confinement effects in laser-induced breakdown spectroscopy

2007 ◽  
Vol 91 (8) ◽  
pp. 081501 ◽  
Author(s):  
X. K. Shen ◽  
J. Sun ◽  
H. Ling ◽  
Y. F. Lu
Keyword(s):  
Laser Induced Breakdown Spectroscopy ◽  
Confinement Effects ◽  
Spatial Confinement ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

Optimization of distances between the target surface and focal point on spatially confined laser-induced breakdown spectroscopy with a cylindrical cavity

2017 ◽  
Vol 32 (2) ◽  
pp. 367-372 ◽  
Author(s):  
Jin Guo ◽  
Junfeng Shao ◽  
Tingfeng Wang ◽  
Changbin Zheng ◽  
Anmin Chen ◽  
...  
Keyword(s):  
Emission Spectroscopy ◽  
Optical Emission Spectroscopy ◽  
Focal Point ◽  
Optical Emission ◽  
Target Surface ◽  
Laser Induced Breakdown Spectroscopy ◽  
Spatial Confinement ◽  
Laser Induced Plasma ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

The spatial confinement effect in laser-induced plasma with different distances between the target surface and focal point is investigated by optical emission spectroscopy.

scholarly journals Detection of cadmium in soils using laser-induced breakdown spectroscopy combined with spatial confinement and resin enrichment

RSC Advances ◽  
2018 ◽  
Vol 8 (69) ◽  
pp. 39635-39640 ◽  
Author(s):  
Xinglan Fu ◽  
Guanglin Li ◽  
Hongwu Tian ◽  
Daming Dong
Keyword(s):  
Heavy Metals ◽  
Environmental Pollution ◽  
Laser Induced Breakdown Spectroscopy ◽  
Monitoring And Control ◽  
Spatial Confinement ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
And Control ◽  
Heavy Metals In Soils

The determination of heavy metals in soils is of great significance for the monitoring and control of environmental pollution.

Effect of cylindrical cavity height on laser-induced breakdown spectroscopy with spatial confinement

2017 ◽  
Vol 19 (2) ◽  
pp. 025506 ◽  
Author(s):  
Junfeng Shao (邵俊峰) ◽  
Tingfeng Wang (王挺峰) ◽  
Jin Guo (郭劲) ◽  
Anmin Chen (陈安民) ◽  
Mingxing Jin (金明星)
Keyword(s):  
Cylindrical Cavity ◽  
Laser Induced Breakdown Spectroscopy ◽  
Spatial Confinement ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

Laser-Induced Breakdown Spectroscopy Combined With Spatial Confinement of Plasmas and Laser-Induced Fluoresence for Trace-Materials Detection

2009 ◽  
Author(s):  
Y. F. Lu ◽  
X. K. Shen ◽  
H. Ling
Keyword(s):  
Optical Parametric Oscillator ◽  
Nd:Yag Laser ◽  
Emission Intensity ◽  
Laser Induced Breakdown Spectroscopy ◽  
Spatial Confinement ◽  
Breakdown Spectroscopy ◽  
Optical Parametric ◽  
Laser Induced Breakdown ◽  
Plasma Plumes ◽  
Atomic Lines

Laser-induced breakdown spectroscopy (LIBS) with spatial confinement effects and LIBS combined with laser-induced fluorescence (LIBS-LIF) have been investigated to improve the detection sensitivity and element-selectivity of LIBS. An obvious enhancement in the emission intensity of aluminum (Al) atomic lines was observed when a cylindrical wall was placed to spatially confine the plasma plumes. The maximum enhance factor for the emission intensity of Al atomic lines was measured to be around 10. Assuming local thermodynamic equilibrium conditions, the plasma temperatures are estimated to be in a range from 4,000 to 5,800 K. It shows that the plasma temperature increased by around 1,000 K when the cylindrical confinement was applied. Fast images of the laser-induced Al plasmas show that the plasmas were compressed into a smaller volume with a pipe presented. LIBS-LIF has been investigated to overcome the matrix effects of LIBS for the detection of trace uranium (U) in solids. An optical parametric oscillator wavelength-tunable laser was used to resonantly excite the uranium atoms and ions within the plasma plumes generated by a Q-switched Nd:YAG laser. Both atomic and ionic lines can be selected to detect their fluorescence lines. A U concentration of 462 ppm in a glass sample can be detected using this technique at an excitation wavelength of 385.96 nm for resonant excitation of U II and a fluorescence line wavelength of 409.01 nm from U II. The mechanism of spatial confinement effects and the influence of relevant operational parameters of LIBS-LIF are discussed. In this work, detection in open air of trace phosphorus (P) in steels using LIBS-LIF has also been investigated. The optical parametric oscillator laser was used to resonantly excite the P atoms within plasma plumes generated by the Q-switched Nd:YAG laser. A set of steel samples with P concentrations from 3.9 to 720 ppm were analyzed using LIBS-LIF at wavelengths of 253.40 and 253.56 nm for resonant excitation of P atoms and fluorescence lines at wavelengths of 213.55 and 213.62 nm. The calibration curves were measured to determine the limit of detection for P in steels, which is estimated to be around 0.7 ppm.

scholarly journals Spatial confinement effects employed by metallic blocker and Ar gas pressures on laser-induced breakdown spectroscopy and surface modifications of laser-irradiated Mg

2017 ◽  
Vol 35 (2) ◽  
pp. 313-325 ◽  
Author(s):  
A. Hayat ◽  
S. Bashir ◽  
M. S. Rafique ◽  
R. Ahmed ◽  
M. Akram ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Electron Number Density ◽  
Number Density ◽  
Confinement Effects ◽  
Electron Number ◽  
Plasma Parameters ◽  
Spatial Confinement ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Ar Gas

AbstractSpatial confinement effects on plasma parameters and surface morphology of laser-ablated Mg are studied by introducing a metallic blocker as well as argon (Ar) gas at different pressures. Nd: YAG laser at various fluences ranging from 7 to 28 J/cm2 was employed to generate Mg plasma. Confinement effects offered by metallic blocker are investigated by placing the blocker at different distances of 6, 8, and 10 mm from the target surface; whereas spatial confinement offered by environmental gas is explored under four different pressures of 5, 10, 20, and 50 Torr. Laser-induced breakdown spectroscopy analysis revealed that both plasma parameters, that is, excitation temperature and electron number density initially are strongly dependent upon both pressures of environmental gases and distances of blockers. The maximum electron temperature of Mg plasma is achieved at Ar gas pressure of 20 Torr, whereas maximum electron number density is achieved at 50 Torr. It is also observed that spatial confinement offered by metallic blocker is responsible for the significant enhancement of both electron temperature and electron number density of Mg plasma. Maximum values of electron temperature and electron number density without blocker are 8335 K and 2.4 × 1016 cm−3, respectively, whereas these values are enhanced to 12,200 K and 4 × 1016 cm−3 in the presence of blocker. Physical mechanisms responsible for the enhancement of Mg plasma parameters are plasma compression, confinement and pronounced collisional excitations due to reflection of shock waves. Scanning electron microscope analysis was performed to explore the surface morphology of laser-ablated Mg. It reveals the formation of ripples and channels that become more distinct in the presence of blocker due to plasma confinement. The optimum combination of blocker distance, fluence and Ar pressure can identify the suitable conditions for defining the role of plasma parameters for surface structuring.

Spatial confinement in laser-induced breakdown spectroscopy

2016 ◽  
Vol 50 (1) ◽  
pp. 015203 ◽  
Author(s):  
Xingwen Li ◽  
Zefeng Yang ◽  
Jian Wu ◽  
Wenfu Wei ◽  
Yan Qiu ◽  
...  
Keyword(s):  
Laser Induced Breakdown Spectroscopy ◽  
Spatial Confinement ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown
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