Download or read book Scattering based Determination of Electron Energies and Concentrations and Gas Kinetic Temperatures in the Inductively Coupled Plasma written by Kim A. Marshall and published by . This book was released on 1987 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1988 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A New Procedure for Determination of Electron Temperatures and Electron Concentrations by Thomson Scattering and Analytical Plasmas written by Huang Mao and published by . This book was released on 1988 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new data-treatment procedure allows for more accurate determination of electron temperatures and electron concentrations in analytical plasmas. A Thomson scattering spectrum, useful for these determinations, is often not purely Gaussian in shape, even when the probed electrons possess a Maxwellian velocity distribution. Nonetheless, an unambiguous relationship exists between electron temperatures and concentrations that truly exist in a plasma and those calculated from a distorted Thompson scattering spectrum. Understanding this relationship permits a look-up table to be constructed, from which observed values can be corrected. Theory concerning this procedure is described and details for using it with both a ruby laser and frequency doubled Nd: YAG laser are discussed. Examples of electron temperature and electron concentration determined with this procedure in an ICP are given. The possibility of using the new procedure to study electron energy distributions is also assessed. Keywords: Thomson scattering; Inductively coupled plasma; Multielement analysis; Electron temperatures; Electron concentrations. (jhd).
Download or read book Technical Reports Awareness Circular TRAC written by and published by . This book was released on 1988-06 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1999 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index to American Doctoral Dissertations written by and published by . This book was released on 1989 with total page 1252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements of Electron Energy Distribution Function and Neutral Gas Temperature in an Inductively Coupled Plasma written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plasma Technologies for Hazardous Waste Destruction written by G. Bonizzoni and published by . This book was released on 1993 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Vibrational Energy Distribution Electron Density and Electron Temperature Behavior in Nanosecond Pulse Discharge Plasmas by Raman and Thomson Scattering written by Andrew M. Roettgen and published by . This book was released on 2015 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: Kinetic processes controlling N2 vibrational distribution, electron temperature and electron density in nanosecond pulse, nonequilibrium plasma, electric discharges are studied through laser scattering diagnostic techniques. The experiments are conducted in high pulse energy (≥4 mJ/pulse), nanosecond pulse gas discharge plasmas at moderate pressures (75-200 torr) in nitrogen, air, helium, H2-He and O2-He mixtures. In electric discharges, local energy loading is a function of the electron number density (ne) and electron temperature (Te). Furthermore, electron temperature, and more specifically, electron energy distribution function (EEDF) control the electron energy partition in nonequilibrium plasmas by controlling the rates of critical kinetic processes including ionization, vibrational and electronic excitation, and recombination of molecules, atoms and electrons in the gas discharge. Thus, obtaining time-resolved, quantitative measurements for these values (ne, Te, and EEDF) is critical in understanding the energy requirements for sustaining these discharges, as well as discerning how electron energy is partitioned among different molecular energy modes, and which excited species and radicals are generated in the plasma. Furthermore, in molecular plasmas, significant electron energy is loaded into vibrational modes. Study of temporally resolved vibrational distribution function (VDF) and vibrational temperature (Tv) is important in quantifying vibrational energy loading and relaxation in these plasmas. This affects the rate of temperature rise in nanosecond pulse discharges and the afterglow, as well as rates of vibrationally stimulated chemical reactions, such as NO formation. Applications of these studies include plasma flow control (PFC), plasma assisted combustion (PAC), electrically excited laser development and various plasma bio-medical applications.
Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 820 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 1987 Abstracts written by and published by . This book was released on 1987 with total page 954 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 1292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Handbook of Inductively Coupled Plasma Spectrometry written by Michael Thompson and published by Chapman & Hall. This book was released on 1983 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 17th International Symposium on Plasma Chemistry written by Javad T. Mostaghimi and published by . This book was released on 2005 with total page 1284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Emission Spectroscopy to Determine Electron Energy Distributions with Enhanced High Energy tails in low temperature Plasmas written by Shicong Wang and published by . This book was released on 2016 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Low-temperature" plasmas are weakly ionized gases with many technological applications, including the fabrication of integrated circuits. Diagnostics to determine plasma properties are desirable tools for application development, control and model verification. Processes depend on gas phase reactions involving plasma electrons, which are selectively heated to temperatures in the range of kTe~1-10 eV. Because atom and molecule collisions with the most energetic portion of the electron population are responsible for a large proportion of the excitation, ionization and dissociation reactions central to plasma applications, diagnostics to measure this portion of the electron energy distribution function (EEDF) hold particular value. The topic of this study is a non-invasive diagnostic that makes use of the wavelength dependence of the spectrum of emitted light from the plasma to determine the high-energy portion of the EEDF. A previously developed emission model employs published energy-dependent collision probabilities to compute relative light intensities for a set of characteristic emission wavelengths. Spectra are computed using this model for set of trial EEDFs and the “best fit” EEDF is selected from this set as that for which the predicted spectrum is found to be closest to the measured spectrum. The analysis relies on the use of a mathematical function with adjustable parameters to express the forms of the energy dependence in the trial EEDFs. One notable contribution of this study is the introduction of the log-normal distribution as a simple function that can represent a wide range of shapes (energy dependence) for the high-energy portions of EEDFs. The diagnostic was implemented on an inductively coupled plasma with an auxiliary electron source. The EEDF was manipulated systematically by varying the current and energy of the injected electrons. While the original emission model employed light emissions resulting only from the electronic excitation of neutral argon atoms, it was found that additional wavelengths corresponding to higher energy excitation thresholds are needed. Robust measurements of the EEDF tail were achieved for a range of operating conditions through the inclusion of emissions from Ar+ ions and the use of a gas mixture of argon, helium and neon in both experiment and emission model.
