Numerical Modeling of the Plasma-particle Interactions of Aerosol Vaporization in a Laser-induced Plasma PDF Download
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Author: Philip B. Jackson
Publisher:
ISBN:
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Languages : en
Pages :
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ABSTRACT: Laser-Induced Breakdown Spectroscopy (LIBS) is a powerful and well-established atomic emission diagnostic for the identification and analysis of unknown samples. Recent research efforts have shown that LIBS is useful for both qualitative identification and for the quantitative measurement of relative as well as absolute analyte concentration regardless of analyte state. More recently, much interest has been directed toward the use of LIBS in the analysis of aerosol systems, including those generated by laser ablation (LA-LIBS). While LIBS offers many advantages as a diagnostic tool, there are several difficulties that limit its capability and robustness. Chief among these are matrix effects and incomplete or inhomogeneous sample vaporization. In an effort to fully understand, and eventually mitigate, these difficulties, the current work seeks to design and implement a numerical model that describes the complex plasma-particle interactions that govern the LIBS of aerosol systems. The model incorporates the processes of heat transfer, hydrodynamics, mass diffusion, vaporization, and electromagnetism. The model considers the fundamental physics of three distinct regimes: the global plasma environment, the local particle behavior, and the initial nature of plasma inception.
Author: Philip B. Jackson
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
ABSTRACT: Laser-Induced Breakdown Spectroscopy (LIBS) is a powerful and well-established atomic emission diagnostic for the identification and analysis of unknown samples. Recent research efforts have shown that LIBS is useful for both qualitative identification and for the quantitative measurement of relative as well as absolute analyte concentration regardless of analyte state. More recently, much interest has been directed toward the use of LIBS in the analysis of aerosol systems, including those generated by laser ablation (LA-LIBS). While LIBS offers many advantages as a diagnostic tool, there are several difficulties that limit its capability and robustness. Chief among these are matrix effects and incomplete or inhomogeneous sample vaporization. In an effort to fully understand, and eventually mitigate, these difficulties, the current work seeks to design and implement a numerical model that describes the complex plasma-particle interactions that govern the LIBS of aerosol systems. The model incorporates the processes of heat transfer, hydrodynamics, mass diffusion, vaporization, and electromagnetism. The model considers the fundamental physics of three distinct regimes: the global plasma environment, the local particle behavior, and the initial nature of plasma inception.
Author: Jorge E. Carranza
Publisher:
ISBN:
Category :
Languages : en
Pages : 304
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Author: Prasoon K. Diwakar
Publisher:
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Category :
Languages : en
Pages :
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Critical understanding of plasma-particle interactions includes study of the plasma evolution, analyte atomization, and the particle dissociation and diffusion. In this dissertation, temporal and spatial studies have been done to understand the fundamentals of the LIBS processes including the breakdown of gases by the laser pulse, plasma inception mechanisms, plasma evolution, analyte introduction and plasma-particle interactions and their influence on LIBS signal. Spectral measurements were performed in a laser-induced plasma and the results reveal localized perturbations in the plasma properties in the vicinity of the analyte species, for first 60 [mu]s. The measurements provide direct evidence of matrix effects in the LIBS plasma at early times. Electron density measurements at very early times in the plasma reveal deviations from the Local Thermodynamic Equilibrium conditions (LTE). The data from various experiments suggests a complex interaction between the plasma and the aerosol particle, during which the finite time-scales of particle dissociation, and heat and mass transfer are fundamental processes.
Author: William Kruer
Publisher: CRC Press
ISBN: 1000754200
Category : Science
Languages : en
Pages : 197
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Book Description
This book focuses on the physics of laser plasma interactions and presents a complementary and very useful numerical model of plasmas. It describes the linear theory of light wave propagation in plasmas, including linear mode conversion into plasma waves and collisional damping.
Author: Jagdish P. Singh
Publisher: Elsevier
ISBN: 0128188308
Category : Science
Languages : en
Pages : 624
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Book Description
Laser-Induced Breakdown Spectroscopy, Second Edition, covers the basic principles and latest developments in instrumentation and applications of Laser Induced Breakdown Spectroscopy (LIBS). Written by active experts in the field, it serves as a useful resource for analytical chemists and spectroscopists, as well as graduate students and researchers engaged in the fields of combustion, environmental science, and planetary and space exploration. This fully revised second edition includes several new chapters on new LIBS techniques as well as several new applications, including flame and off-gas measurement, pharmaceutical samples, defense applications, carbon sequestration and site monitoring, handheld instruments, and more. LIBS has rapidly developed into a major analytical technology with the capability of detecting all chemical elements in a sample, of real- time response, and of close-contact or stand-off analysis of targets. It does not require any sample preparation, unlike conventional spectroscopic analytical techniques. Samples in the form of solids, liquids, gels, gases, plasmas, and biological materials (like teeth, leaves, or blood) can be studied with almost equal ease. This comprehensive reference introduces the topic to readers in a simple, direct, and accessible manner for easy comprehension and maximum utility. - Covers even more applications of LIBS beyond the first edition, including combustion, soil physics, environment, and life sciences - Includes new chapters on LIBS techniques that have emerged in the last several years, including Femtosecond LIBS and Molecular LIBS - Provides inspiration for future developments in this rapidly growing field in the concluding chapter
Author: Andrey Sladkov
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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This thesis is a numerical study of the magnetic reconnection in collisionless plasmas using a kinetic code. We can study the magnetic reconnection process during experiments for which the plasma is created by interaction of a power laser on a solid target. During this thesis, we included in the HECKLE code the elements allowing to make these simulations more realistic for the laser conditions: the effects of the electron six-component pressure tensor as well as the super-Alfvénic expansion of the plasma. We have thus highlighted the role of the pressure tensor to reduce the efficiency of the reconnection, as well as the plasma temperature effects making it more impulsive.
Author: Amol Holkundkar
Publisher: LAP Lambert Academic Publishing
ISBN: 9783845419381
Category :
Languages : en
Pages : 160
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Development of high power lasers opened a new era of scientific innovations. Now it is possible to study the matter properties under extreme conditions applicable to large number of potential applications. The field of laser-plasma interaction is very vast and wealthy in content. In this thesis we present three basic aspects related to the subject.We have developed a new model for laser interaction with solid targets which is applicable for the laser pulse duration ranging from femtoseconds to picoseconds. The benchmarking of the model is done by testing various special cases. The absorption model is coupled with one dimension radiation hydrodynamics, opacity and equation of state data in order to simulate various experiments. The interaction of laser with atomic cluster is also investigated in this monograph. A new hydrodynamic model for laser cluster interaction is presented. Our model takes into account the radial non-uniformity of the expanding cluster under the influence of incident laser. Finally the laser induced ion acceleration is also studied using one dimensional particle-in-cell code.
Author: Shankar Ghosh
Publisher:
ISBN:
Category :
Languages : en
Pages : 220
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Author: Konstantinos Koutsakis
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Joseph Magill
Publisher:
ISBN:
Category :
Languages : en
Pages :
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