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Polarisation Resolved Spectroscopy Of Laser Produced Plasmas
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Book Synopsis Polarisation Resolved Spectroscopy of Laser Produced Plasmas by : Getasew Admasu Wubetu
Download or read book Polarisation Resolved Spectroscopy of Laser Produced Plasmas written by Getasew Admasu Wubetu and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The degree of polarisation of the light emitted from laser produced plasmas has been studied using time-resolved imaging along with time- and polarisation-resolved spectroscopy in the visible spectral range. A Q-switched Nd: YAG laser (wavelength = 1064 nm, pulse width = 14 ns) was used to ablate the target. Optical spectra were obtained using a Czerny-Turner spectrometer equipped with an intensified charge-coupled device (ICCD) readout. A Wollaston prism split the emitted radiation into orthogonally polarised states for simultaneous spectral acquisition. Polarisation anisotropy in line emission is the result of a non-statistical distribution of population amongst the available magnetic sublevels in the upper state of the transition of interest. The origin of the non-statistical distribution lies in an anisotropy in the electron velocity distribution function (EVDF) which is the most often described by a bi-Maxwellian function. For the continuum emission, it is found that the main contributor is recombination radiation and once again an EVDF anisotropy is the origin. In this case the partially preferred direction of motion of the recombining electrons is transferred into a partially preferred polarisation direction. The imaging results reveal stronger plasma emission polarisation in air than in vacuo. They also showed stronger polarisation of the continuum emission compared to line emission at higher pressure for Al (at 396.15 nm) and Al+ (466.3 nm) features. In vacuo, the degree of polarisation (P) of all charge states studied oscillates with time. It is suggested that this oscillation is a result of self-generated magnetic fields which cause the plasma itself to undergo compression and rarefraction cycles. In this case the EVDF will also oscillate and hence the degree of polarisation will do so. The magnetic field itself is thought to arise from a Rayleigh-Taylor (RT) instability. The effects of target geometry and incident laser polarisation on the emission were also studied. A greater effect was observed for continuum radiation compared to line emission. It is also observed that the laser polarisation has the greatest effect for oblique incidence on the target.
Book Synopsis Space and Time Resolved Spectroscopy of Laser-produced Plasmas by : Bruce Kai Fong Young
Download or read book Space and Time Resolved Spectroscopy of Laser-produced Plasmas written by Bruce Kai Fong Young and published by . This book was released on 1988 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Plasma Polarization Spectroscopy by : Takashi Fujimoto
Download or read book Plasma Polarization Spectroscopy written by Takashi Fujimoto and published by Springer Science & Business Media. This book was released on 2007-12-22 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: You’ll learn all the underlying science and how to perform all the latest analytical techniques that plasma polarization spectroscopy (PPS) offers with this new book. The authors report on recent results of laboratory experiments, keeping you current with all the latest developments and applications in the field. There is also a timely discussion centered on instrumentation that is crucial to your ability to perform successful PPS experiments.
Book Synopsis Space and Time Resolved Spectroscopy of Laser-produced Plasmas by :
Download or read book Space and Time Resolved Spectroscopy of Laser-produced Plasmas written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The determination of level populations and detailed population mechanisms in dense plasmas has become an increasingly important problem in atomic physics. In this work, the density variation of line intensities and level populations in aluminum K-shell and molybdenum and silver L-shell emission spectra have been measured from high-powered, laser-produced plasmas. For each case, the density dependence of the observed line emission is due to the effect of high frequency electron-ion collisions on metastable levels. The density dependent line intensities vary greatly in laser-produced plasmas and can be used to extract detailed information concerning the population kinetics and level populations of the ions. The laser-plasmas had to be fully characterized in order to clearly compare the observed density dependence with atomic theory predictions. This has been achieved through the combined use of new diagnostic instruments and microdot targets which provided simultaneously space, time, and spectrally resolved data. The plasma temperatures were determined from the slope of the hydrogen-like recombination continuum. The time resolved electron density profiles were measured using multiple frame holographic interferometry. Thus, the density dependence of K-shell spectral lines could be clearly examined, independent of assumptions concerning the dynamics of the plasma. In aluminum, the electron density dependence of various helium-like line intensity ratios were measured. Standard collisional radiative equilibrium models fail to account for the observed density dependence measured for the ''He/sub .cap alpha.//IC'' ratio. Instead, a quasi-steady state atomic model based on a purely recombining plasma is shown to accurately predict the measured density dependence. This same recombining plasma calculation successfully models the density dependence of the high-n ''He/sub .gamma.//He/sub .beta./'' and ''He/sub delta//He/sub .beta./'' helium-like resonance line intensity ratios.
Book Synopsis Time-resolved Spectroscopy of Nonequilibrium Ionization in Laser-produced Plasmas by : Robin Stewart Marjoribanks
Download or read book Time-resolved Spectroscopy of Nonequilibrium Ionization in Laser-produced Plasmas written by Robin Stewart Marjoribanks and published by . This book was released on 1988 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Time-resolved Spectroscopic Studies of Laser-produced Plasmas by :
Download or read book Time-resolved Spectroscopic Studies of Laser-produced Plasmas written by and published by . This book was released on 1982 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Imaging and Spectroscopy of Laser Produced Annular Plasmas by : Ben Delaney
Download or read book Imaging and Spectroscopy of Laser Produced Annular Plasmas written by Ben Delaney and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser induced breakdown spectroscopy (LIBS) has emerged as a commonly used analytical technique for both qualitative elemental identification and quantitative concentration determination in various academic and industrial fields. The ultimate performance of LIBS is dependent on the signal to background ratio (SBR) of the spectra which are acquired from a sample and is quantified as the limit of detection (LOD) of the technique. A significant body of work has already been reported in the literature aimed at lowering of the LOD of LIBS. This work includes investigations into the effects of; laser fluence, wavelength and pulse length as well as space and time optimization, along with double pulse plasma formation and reheating arrangements. The aim of the work presented here is to generate and investigate the stagnation layer formed in vacuo, at the centre of an annular plasma, and to employ it in a LIBS experiment on trace Cu in Al. This is achieved by retrofitting a single optical element, namely an axicon, to the focusing lens normally used for point plasma formation. Spatially and temporally resolved imaging and spectroscopy are employed to track the formation and evolution of a stagnation layer at the centre of an annular plasma. Comparisons of these imaging and spectroscopy measurements are drawn with those obtained for a stagnation layer formed between two point seed plasmas, as well as for single laser produced plasma. An off axis parabolic mirror was used to carry out imaging and spectroscopy along the plasma expansion axis, normal to the target. A simple relay lens system was used for imaging and spectroscopy parallel to the target surface. The former is, to the best of my knowledge, the first time such an investigation into stagnation layers has been undertaken. The targets used were slabs of aluminium with trace amounts of copper. Point, dual colliding and annular colliding plasmas were investigated to determine their relative merits in laser induced breakdown spectroscopy. It found that the limit-of-detection for trace amounts of Cu in Al is lowest for annular plasmas formed at low laser pulse energies of ca. 25 - 30 mJ.
Book Synopsis Polarization and Directional Effects in the Radiation from Plasmas by : Eugene Oks
Download or read book Polarization and Directional Effects in the Radiation from Plasmas written by Eugene Oks and published by . This book was released on 2024-04-02 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book covers various polarization and directional effects - practically important for diagnostics of plasmas - in the radiation of satellites of spectral lines from plasmas, in the intra-Stark spectroscopy of plasmas, in the Stark broadening of spectral lines by a high-energy hydrogen or deuterium beam, or by a relativistic electron beam in magnetic fusion plasmas, in the Stark broadening of spectral lines in strongly-magnetized plasmas, in the radiation of plasma-based x-ray lasers, and in the laser-induced fluorescence from plasmas.
Book Synopsis Laser Interactions with Atoms, Solids and Plasmas by : Richard M. More
Download or read book Laser Interactions with Atoms, Solids and Plasmas written by Richard M. More and published by Springer Science & Business Media. This book was released on 2013-11-21 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this NATO Advanced Study Institute was to bring together scientists and students working in the field of laser matter interactions in order to review and stimulate developmentoffundamental science with ultra-short pulse lasers. New techniques of pulse compression and colliding-pulse mode-locking have made possible the construction of lasers with pulse lengths in the femtosecond range. Such lasers are now in operation at several research laboratories in Europe and the United States. These laser facilities present a new and exciting research direction with both pure and applied science components. In this ASI the emphasis is on fundamental processes occurring in the interaction of short laser pulses with atoms, molecules, solids, and plasmas. In the case of laser-atom (molecule) interactions, high power lasers provide the first access to extreme high-intensity conditions above 10'8 Watts/em', a new frontier for nonlinear interaction of photons with atoms and molecules. New phenomena observed include multiphoton ionization processes, atomic collisions in the presence of a strong laser field, Coulomb explosion following rapid ionization of a molecule and the production of high harmonics of the laser source. Another important topic reviewed in this ASI is the lasercooling ofatoms.
Book Synopsis Principles of Laser Plasmas by : George Bekefi
Download or read book Principles of Laser Plasmas written by George Bekefi and published by . This book was released on 1976 with total page 695 pages. Available in PDF, EPUB and Kindle. Book excerpt: Good,No Highlights,No Markup,all pages are intact, Slight Shelfwear,may have the corners slightly dented, may have slight color changes/slightly damaged spine.
Book Synopsis Optical and Ion Energy Spectroscopy of Laser-produced Plasmas by : Gregory John Tallents
Download or read book Optical and Ion Energy Spectroscopy of Laser-produced Plasmas written by Gregory John Tallents and published by . This book was released on 1978 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spectroscopic Diagnostics of Laser Produced Plasmas by : Norman David Delamater
Download or read book Spectroscopic Diagnostics of Laser Produced Plasmas written by Norman David Delamater and published by . This book was released on 1984 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Time-resolved Optical Emission Spectroscopy of Laser-induced Plasmas on Copper and Aluminum Surfaces and in a Graphite Furnace by : Martha Rosentrater Joseph
Download or read book Time-resolved Optical Emission Spectroscopy of Laser-induced Plasmas on Copper and Aluminum Surfaces and in a Graphite Furnace written by Martha Rosentrater Joseph and published by . This book was released on 1994 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser-Plasma Interactions by : Dino A. Jaroszynski
Download or read book Laser-Plasma Interactions written by Dino A. Jaroszynski and published by CRC Press. This book was released on 2009-03-27 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Solid Compendium of Advanced Diagnostic and Simulation ToolsExploring the most exciting and topical areas in this field, Laser-Plasma Interactions focuses on the interaction of intense laser radiation with plasma. After discussing the basic theory of the interaction of intense electromagnetic radiation fields with matter, the book covers three ap
Book Synopsis Plasma Spectroscopy by : Evgeniĭ Aleksandrovich Oks
Download or read book Plasma Spectroscopy written by Evgeniĭ Aleksandrovich Oks and published by Springer. This book was released on 1995 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma Spectroscopy develops the foundation of spectroscopy for plasmas containing quasi-monochromatic electric fields in the microwaves or optical range. This topic is of major importance for plasma spectroscopy and the diagnostic of technological microwave and radiofrequency discharges, plasma lasers of microwave, optical, and x-ray ranges, pulsed discharges employed as advanced radiation sources, magnetic and laser fusion, and ionospheric and astrophysical plasmas. This monograph presents novel nonlinear-optical methods for theoretical analysis of radiation of quantum systems in media, describes principles for measuring the field and plasma parameters, and discusses their practical applications.
Book Synopsis Polarized Light in Optics and Spectroscopy by : David S. Kliger
Download or read book Polarized Light in Optics and Spectroscopy written by David S. Kliger and published by Elsevier. This book was released on 2012-12-02 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive introduction to polarized light provides students and researchers with the background and the specialized knowledge needed to fully utilize polarized light. It provides a basic introduction to the interaction of light with matter for those unfamiliar with photochemistry and photophysics. An in-depth discussion of polarizing optics is also given. Different analytical techniques are introduced and compared and introductions to the use of polarized light in various forms of spectroscopy are provided. Starts at a basic level and develops tools for research problems Discusses practical devices for controlling polarized light Compares the Jones, Mueller, and Poincaré sphere methods of analysis
Book Synopsis Experimental and Computational K-shell Spectroscopy of Laser Produced Plasmas by :
Download or read book Experimental and Computational K-shell Spectroscopy of Laser Produced Plasmas written by and published by . This book was released on 2006 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt:
