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 Thomson Scattering for Determining Electron Concentrations and Temperatures in an Inductively Coupled Plasma 1 Assessment of the Technique for a Lo Flow Low Power Plasma written by Kim A. Marshall and published by . This book was released on 1988 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron number densities and electron temperatures have been measured by multichannel Thomson scattering in a low-flow low-power inductively coupled plasma. Preliminary electron-concentration values agree well with those previously determined, and spatial variation in both electron concentration and temperature are largely consistent with existing models of the ICP. One difference is that aqueous aerosol was found here to depress the electron number density throughout the plasma. Unfortunately, the intensities measured in the wings of the Thomson-scattering spectrum large uncertainties, making data analysis difficult and the measured electron temperatures less reliable than desired.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1989 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Inductively Coupled Plasmas in Analytical Atomic Spectrometry written by Akbar Montaser and published by John Wiley & Sons. This book was released on 1996-12-17 with total page 1044 pages. Available in PDF, EPUB and Kindle. Book excerpt: The broadest source of information on analytical ICP spectrometry available in a coherent, single volume. Renowned contributors define theory, diagnostics, models, instrumentation and applications. They also discuss atomic emission, atomic fluorescence and mass spectrometries based on ICP sources for atomization, excitation and ionization. 'This book is HIGHLY RECOMMENDED.' Analytical Chemistry '... a handy reference for anyone attempting to understand the theory of ICPs and how they work. The detailed discussions of the various types of instrumentation and methods will be quite helpful to students and researchers in the field who want to broaden their understanding of analytical atomic spectroscopy.' Applied Spectroscopy '...Everyone involved in elemental analysis using ICP should have this book. It is useful for both experienced and novice ICP spectroscopists.' Spectroscopy
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Download or read book Thomson Scattering for Determining Electron Concentrations and Temperatures in an Inductively Coupled Plasma 2 Description and Evaluation of a Multichannel Instrument written by Kim A. Marshall and published by . This book was released on 1988 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new instrument has been assembled to measure Thomson scattering from an inductively coupled plasma. Unlike previous designs, the new system employs a fiber-optic array to measure simultaneously up to 12 channels on a Thomson-scattering spectrum. Shutters enable either side of the nominally symmetrical Thomson spectrum to be examined, or permit summing equally spaced channels on opposite sides of the spectrum from the incident laser wavelength. A central channel, use to monitor Rayleigh scattering, enables a simultaneous determination of true gas-kinetic temperatures. Photodetector fatigue is avoided through a rotating mirror that serves as an optical shutter while individual gated integrators attached to each detector minimize the detection of background radiation from the plasma. The new instrument offers high stray-light rejection capability and provides measurements whose precision is photon-limited. Results obtained with the new instrument are presented in a companion paper.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1988 with total page 1132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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