Download or read book Development and Calibration of Electron Density Measurements in Argon Plasma Using Laser Collision Induced Fluorescence written by and published by . This book was released on 2015 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development and Calibration of Electron Density Measurements in Argon Plasma Using Laser CollisionU 2010induced Fluorescence written by and published by . This book was released on 2013 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plasma Electron Density Measurements by Laser and Collision induced Fluorescence Method written by K. Tsuchida and published by . This book was released on 1982 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Behavior of Excited Argon Atoms in Inductively Driven Plasmas written by and published by . This book was released on 1999 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser induced fluorescence has been used to measure the spatial distribution of the two lowest energy argon excited states, 1s5 and 1s4, in inductively driven plasmas containing argon, chlorine and boron trichloride. The behavior of the two energy levels with plasma conditions was significantly different, probably because the 1s5 level is metastable and the 1s4 level is radiatively coupled to the ground state but is radiation trapped. The argon data is compared with a global model to identify the relative importance of processes such as electron collisional mixing and radiation trapping. The trends in the data suggest that both processes play a major role in determining the excited state density. At lower rfpower and pressure, excited state spatial distributions in pure argon were peaked in the center of the discharge, with an approximately Gaussian profile. However, for the highest rfpowers and pressures investigated, the spatial distributions tended to flatten in the center of the discharge while the density at the edge of the discharge was unaffected. The spatially resolved excited state density measurements were combined with previous line integrated measurements in the same discharge geometry to derive spatially resolved, absolute densities of the 1s5 and 1s4 argon excited states and gas temperature spatial distributions. Fluorescence lifetime was a strong fi.mction of the rf power, pressure, argon fraction and spatial location. Increasing the power or pressure resulted in a factor of two decrease in the fluorescence lifetime while adding Cl2 or BCl3 increased the fluorescence lifetime. Excited state quenching rates are derived from the data. When Cl2 or BCl3 was added to the plasma, the maximum argon metastable density depended on the gas and ratio. When chlorine was added to the argon plasma, the spatial density profiles were independent of chlorine fraction. While it is energetically possible for argon excited states to dissociate some of the molecular species present in this discharge, it does not appear to be a significant source of dissociation. The major source of interaction between the argon and the molecular species BCl3 and Cl2 appears to be through modification of the electron density.
Download or read book Determination of the Electron Density in an Argon Plasma Using a Laser Interferometer written by Ladislaus S. Lubaczewski (Jr.) and published by . This book was released on 1967 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electron Density Measurements in a 1 Ev Plasma Using Scattering from a Laser written by Edward H. Bailey and published by . This book was released on 1966 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plasma Spectroscopy written by Takashi Fujimoto and published by Clarendon Press. This book was released on 2004-06-17 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the characteristics of optical radiation, or a spectrum, emitted by various plasmas. In plasma, the same atomic species can produce quite different spectra, or colours, depending on the nature of the plasma. This book gives a theoretical framework by which a particular spectrum can be interpreted correctly and coherently. The uniqueness of the book lies in its comprehensive treatment of the intensity distribution of spectral lines and the population density distribution among the atomic levels in plasmas. It is intended to provide beginners with a good perspective of the field, laying out the physics in an extremely clear manner and starting from an elementary level. A useful feature of the book is the asterisked sections and chapters which can be skipped by readers who only wish to gain a quick and basic introduction to plasma spectroscopy. It will also be useful to researchers working actively in the field, acting as a guide for carrying out experiments and interpreting experimental observations.
Download or read book Neutral Depletion and Ion Acceleration in an Argon Helicon Plasma written by C. Mark Denning and published by . This book was released on 2008 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fusion Energy Update written by and published by . This book was released on 1985 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Implementation and Testing of a Laser Induced Fluorescence System for the Characterization of a Multipolar Electron Cyclotron Resonance Plasma Reactor written by Gregory Louis King and published by . This book was released on 1991 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electron Density and Collision Frequency of Arc heated Argon Plasma written by R. C. JR. WARDER and published by . This book was released on 1962 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Absolute Number Density Measurements of Atomic Species in Air and Nitrogen Plasmas written by Jeffrey C Schindler and published by . This book was released on 2021 with total page 1121 pages. Available in PDF, EPUB and Kindle. Book excerpt: A vehicle reentering Earth's atmosphere at hypersonic velocities violently compresses the air in front of it, creating a shell of plasma at the surface. This plasma imparts energy onto the vehicle's surface via convective, radiative, and chemical heating. Currently, large uncertainties in measurements of surface reaction rates lead to over-designed thermal protection systems. Improvements in the precision of these measurements could substantially decrease the weight of the heat shield, freeing up space for additional fuel or human/scientific payload. This work aims to improve current methods for measurements of atomic number densities in plasmas, so that they may be applied to future measurements of surface reaction rates. In this work, relative number densities are measured by probing atomic species in an inductively coupled plasma with two-photon absorption laser induced fluorescence. The use of a room temperature flow reactor as a reference source allows for absolute calibration of relative number density measurements while removing many constants, and their uncertainties, from the calculation. Temperature and number density measurements in the free stream of air and nitrogen plasmas suggest near equilibrium populations of both oxygen and nitrogen atoms. Improvements in methods for fluorescence lifetime measurements, allow for resolution of the lifetimes between 1.5 and 4 ns which are seen in the plasma. Evidence of collision-induced upper state transfer in the plasma is presented. Off line center excitation of N, O, and NO show evidence of higher quenching than is seen at the line-center. Further work is needed to determine if this is a physical phenomenon, or instrumental error.
Download or read book Measurements of Electron Density Evolution and Beam Self Focusing in a Laser Produced Plasma written by L. C. Johnson and published by . This book was released on 1974 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plasma Processing of Materials written by National Research Council and published by National Academies Press. This book was released on 1991-02-01 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma processing of materials is a critical technology to several of the largest manufacturing industries in the worldâ€"electronics, aerospace, automotive, steel, biomedical, and toxic waste management. This book describes the relationship between plasma processes and the many industrial applications, examines in detail plasma processing in the electronics industry, highlights the scientific foundation underlying this technology, and discusses education issues in this multidisciplinary field. The committee recommends a coordinated, focused, and well-funded research program in this area that involves the university, federal laboratory, and industrial sectors of the community. It also points out that because plasma processing is an integral part of the infrastructure of so many American industries, it is important for both the economy and the national security that America maintain a strong leadership role in this technology.
Download or read book Absolute Density Calibration Cell for Laser Induced Fluorescence Erosion Rate Measurements written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-19 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flight qualification of ion thrusters typically requires testing on the order of 10,000 hours. Extensive knowledge of wear mechanisms and rates is necessary to establish design confidence prior to long duration tests. Consequently, real-time erosion rate measurements offer the potential both to reduce development costs and to enhance knowledge of the dependency of component wear on operating conditions. Several previous studies have used laser-induced fluorescence (LIF) to measure real-time, in situ erosion rates of ion thruster accelerator grids. Those studies provided only relative measurements of the erosion rate. In the present investigation, a molybdenum tube was resistively heated such that the evaporation rate yielded densities within the tube on the order of those expected from accelerator grid erosion. This work examines the suitability of the density cell as an absolute calibration source for LIF measurements, and the intrinsic error was evaluated. Domonkos, Matthew T. and Stevens, Richard E. Glenn Research Center; Jet Propulsion Laboratory; Marshall Space Flight Center NASA/TM-2001-211279, E-13078, NAS 1.15:211279, IEPC-01-300
Download or read book Electron Density Measurements from Stark Broadened Emission in a Sodium Plasma Produced by Laser Resonance Saturation written by Mark Antony Cappelli and published by . This book was released on 1987 with total page 400 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 1976-02 with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt:
