Bound-Bound Radiation/Collisional-Radiative Recombination in Oxygen and Nitrogen Plasmas PDF Download
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Author: Larry A. Jones
Publisher:
ISBN:
Category :
Languages : en
Pages : 54
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Book Description
Number densities of several excited states of atomic oxygen and nitrogen have been measured in the decaying non-thermal plasma of a theta-pinch afterglow. The spatial variation of the electron density and temperature as a function of time after the initiation of main bank discharge have also been measured to facilitate a comparison of excited state number densities with model calculations. Measurements of the atomic oxygen excited states indicate that quintet to triplet spin exchange collisions and doubly excited states must be included in the model. The measured populations of the excited atomic nitrogen states agree well with those calculated at high density but disagree badly at lower densities. The discrepancies seem to be real since they are larger than expected measurement uncertainty.
Author: Larry A. Jones
Publisher:
ISBN:
Category :
Languages : en
Pages : 54
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Book Description
Number densities of several excited states of atomic oxygen and nitrogen have been measured in the decaying non-thermal plasma of a theta-pinch afterglow. The spatial variation of the electron density and temperature as a function of time after the initiation of main bank discharge have also been measured to facilitate a comparison of excited state number densities with model calculations. Measurements of the atomic oxygen excited states indicate that quintet to triplet spin exchange collisions and doubly excited states must be included in the model. The measured populations of the excited atomic nitrogen states agree well with those calculated at high density but disagree badly at lower densities. The discrepancies seem to be real since they are larger than expected measurement uncertainty.
Author: Ronald D. Taylor
Publisher:
ISBN:
Category :
Languages : en
Pages : 46
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Book Description
When air is heated and becomes highly ionized, the primary constituents cnsist of nitrogen, oxygen and their ions. Emissions from this plasma provide diagnostic information as well as contribute to cooling the plasma. To describe such a plasma under nonequilibrium conditions one must known the population densities of various excited states. Using a time dependent approach a collisional-radiative model is developed for an oxygen plasma. Effective recombination and ionization coefficients are calculated for two specific cases, optically thin and optically thick in bound-bound UV radiation. The steady state population densities for neutral and ionic states are presented in terms of their deviations from Saha equilibrium predictions. These results show the approach of the plasma to a state of local thermodynamic equilibrium (LTE) as a function of electron temperatures between 1.0 and 3.0 eV and electron densities between 10 to the 16th power and 10 to the 19th power/cc.
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Category : Nuclear energy
Languages : en
Pages : 786
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Category : Aeronautics
Languages : en
Pages : 836
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Author: Joseph M. Harrer
Publisher:
ISBN: 9780870790058
Category : Technology & Engineering
Languages : en
Pages : 1052
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Category : Power resources
Languages : en
Pages : 830
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Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
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Category : Government publications
Languages : en
Pages : 1202
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ISBN:
Category : Science
Languages : en
Pages : 1142
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Category : Government reports announcements & index
Languages : en
Pages : 882
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Author: United States. Army Research Office
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ISBN:
Category : Military research
Languages : en
Pages : 458
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