The Experts below are selected from a list of 199719 Experts worldwide ranked by ideXlab platform
Tamaki Ura - One of the best experts on this subject based on the ideXlab platform.
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investigation of influence of hydrostatic pressure on double pulse laser induced breakdown spectroscopy for detection of cu and zn in submerged solids
Applied Physics Express, 2013Co-Authors: Tomoko Takahashi, Blair Thornton, Tamaki UraAbstract:The effects of pressure on double-pulse laser-induced breakdown spectroscopy (LIBS) for analysis of the composition of solids submerged in water have been investigated. It has been found that while an increase in water pressure results in an overall reduction in Plasma Temperature and increased broadness in the observed spectra, analytically useful spectra can be observed up to 5 MPa (50 atm). The results suggest that double-pulse laser-induced breakdown spectroscopy may be suitable for in situ measurement of the chemical composition of solids submerged in lakes, rivers, and shallow seas.
S N Luo - One of the best experts on this subject based on the ideXlab platform.
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cn and c2 formation mechanisms in fs laser induced breakdown of nitromethane in ar or n2 atmosphere
Journal of Hazardous Materials, 2020Co-Authors: Yue Zhao, H M Hou, J C Shi, S N LuoAbstract:Abstract We investigate atomic and molecular emission of laser-ablated nitromethane in an Ar or N2 buffer gas, with fs laser-induced breakdown spectroscopy. The electronic bands of CN, C2, and NH molecules and the atomic transition lines of C I, N I, and Hα are identified. The time series of the emissions are obtained, and the formation mechanisms of CN and C2 are deduced. The CN violet system, the B2Σ+-X2Σ+ (0-0) band, is chosen to extract Plasma Temperature from the experimental spectra.
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cn and c formula omitted formation mechanisms in fs laser induced breakdown of nitromethane in ar or n formula omitted atmosphere
Journal of Hazardous Materials, 2020Co-Authors: Yue Zhao, H M Hou, J C Shi, S N LuoAbstract:We investigate atomic and molecular emission of laser-ablated nitromethane in an Ar or N2 buffer gas, with fs laser-induced breakdown spectroscopy. The electronic bands of CN, C2, and NH molecules and the atomic transition lines of C I, N I, and Hα are identified. The time series of the emissions are obtained, and the formation mechanisms of CN and C2 are deduced. The CN violet system, the B2Σ+-X2Σ+ (0-0) band, is chosen to extract Plasma Temperature from the experimental spectra.
E Tognoni - One of the best experts on this subject based on the ideXlab platform.
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determination of excitation Temperature in laser induced Plasmas using columnar density saha boltzmann plot
Journal of Advanced Research, 2019Co-Authors: Ali Safi, G Cristoforetti, S Legnaioli, V Palleschi, Hassan S Tavassoli, Fatemeh Rezaei, E TognoniAbstract:Abstract In exploiting the analytical capabilities of Plasma-based spectroscopy method, the evaluation of Plasma parameters, particularly the Plasma Temperature, is a crucial step. In this work, a modified Saha-Boltzmann plot, which uses the columnar densities of atomic and ionic ground levels, is utilized to calculate the Plasma Temperature in a laser-induced Plasma from an aluminum alloy target. The columnar densities are here calculated by quantifying the self-absorption of resonance lines. It is demonstrated that this is a promising method for accurate determination of Plasma Temperature. To validate the capability of this technique, Plasma emission is measured at different gate delay times. For each delay, excitation Temperature is calculated both by the conventional Saha-Boltzmann plot (by using the excited states) and by exploiting the new Columnar Density Saha–Boltzmann (CD-SB) plot. The results suggest that at later times of the Plasma evolution, the CD-SB plot can be more suitable for the determination of Plasma Temperature than conventional Saha-Boltzmann plot. These findings provide a new approach for physical characterization of Plasmas and give access to a wealth of information about the state of Plasma.
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combination of the ionic to atomic line intensity ratios from two test elements for the diagnostic of Plasma Temperature and electron number density in inductively coupled Plasma atomic emission spectroscopy
Spectrochimica Acta Part B: Atomic Spectroscopy, 2007Co-Authors: E Tognoni, Antonio Canals, G Cristoforetti, Montserrat Hidalgo, S Legnaioli, Alessandra Salvetti, V PalleschiAbstract:In Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES) spectrochemical analysis, the MgII(280.270 nm)/MgI(285.213 nm) ionic to atomic line intensity ratio is commonly used as a monitor of the robustness of operating conditions. This approach is based on the univocal relationship existing between intensity ratio and Plasma Temperature, for a pure argon atmospheric ICP in thermodynamic equilibrium. In a multi-elemental Plasma in the lower Temperature range, the measurement of the intensity ratio may not be sufficient to characterize Temperature and electron density. In such a range, the correct relationship between intensity ratio and Plasma Temperature can be calculated only when the complete Plasma composition is known. We propose the combination of the line intensity ratios of two test elements (double ratio) as an effective diagnostic tool for a multi-elemental low Temperature LTE Plasma of unknown composition. In particular, the variation of the double ratio allows us discriminating changes in the Plasma Temperature from changes in the electron density. Thus, the effects on Plasma excitation and ionization possibly caused by introduction of different samples and matrices in non-robust conditions can be more accurately interpreted. The method is illustrated by the measurement of Plasma Temperature and electron density in a specific analytic case.
V Palleschi - One of the best experts on this subject based on the ideXlab platform.
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determination of excitation Temperature in laser induced Plasmas using columnar density saha boltzmann plot
Journal of Advanced Research, 2019Co-Authors: Ali Safi, G Cristoforetti, S Legnaioli, V Palleschi, Hassan S Tavassoli, Fatemeh Rezaei, E TognoniAbstract:Abstract In exploiting the analytical capabilities of Plasma-based spectroscopy method, the evaluation of Plasma parameters, particularly the Plasma Temperature, is a crucial step. In this work, a modified Saha-Boltzmann plot, which uses the columnar densities of atomic and ionic ground levels, is utilized to calculate the Plasma Temperature in a laser-induced Plasma from an aluminum alloy target. The columnar densities are here calculated by quantifying the self-absorption of resonance lines. It is demonstrated that this is a promising method for accurate determination of Plasma Temperature. To validate the capability of this technique, Plasma emission is measured at different gate delay times. For each delay, excitation Temperature is calculated both by the conventional Saha-Boltzmann plot (by using the excited states) and by exploiting the new Columnar Density Saha–Boltzmann (CD-SB) plot. The results suggest that at later times of the Plasma evolution, the CD-SB plot can be more suitable for the determination of Plasma Temperature than conventional Saha-Boltzmann plot. These findings provide a new approach for physical characterization of Plasmas and give access to a wealth of information about the state of Plasma.
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combination of the ionic to atomic line intensity ratios from two test elements for the diagnostic of Plasma Temperature and electron number density in inductively coupled Plasma atomic emission spectroscopy
Spectrochimica Acta Part B: Atomic Spectroscopy, 2007Co-Authors: E Tognoni, Antonio Canals, G Cristoforetti, Montserrat Hidalgo, S Legnaioli, Alessandra Salvetti, V PalleschiAbstract:In Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES) spectrochemical analysis, the MgII(280.270 nm)/MgI(285.213 nm) ionic to atomic line intensity ratio is commonly used as a monitor of the robustness of operating conditions. This approach is based on the univocal relationship existing between intensity ratio and Plasma Temperature, for a pure argon atmospheric ICP in thermodynamic equilibrium. In a multi-elemental Plasma in the lower Temperature range, the measurement of the intensity ratio may not be sufficient to characterize Temperature and electron density. In such a range, the correct relationship between intensity ratio and Plasma Temperature can be calculated only when the complete Plasma composition is known. We propose the combination of the line intensity ratios of two test elements (double ratio) as an effective diagnostic tool for a multi-elemental low Temperature LTE Plasma of unknown composition. In particular, the variation of the double ratio allows us discriminating changes in the Plasma Temperature from changes in the electron density. Thus, the effects on Plasma excitation and ionization possibly caused by introduction of different samples and matrices in non-robust conditions can be more accurately interpreted. The method is illustrated by the measurement of Plasma Temperature and electron density in a specific analytic case.
Tomoko Takahashi - One of the best experts on this subject based on the ideXlab platform.
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investigation of influence of hydrostatic pressure on double pulse laser induced breakdown spectroscopy for detection of cu and zn in submerged solids
Applied Physics Express, 2013Co-Authors: Tomoko Takahashi, Blair Thornton, Tamaki UraAbstract:The effects of pressure on double-pulse laser-induced breakdown spectroscopy (LIBS) for analysis of the composition of solids submerged in water have been investigated. It has been found that while an increase in water pressure results in an overall reduction in Plasma Temperature and increased broadness in the observed spectra, analytically useful spectra can be observed up to 5 MPa (50 atm). The results suggest that double-pulse laser-induced breakdown spectroscopy may be suitable for in situ measurement of the chemical composition of solids submerged in lakes, rivers, and shallow seas.