Recent advancements in laser techniques for plasma facility diagnostic applications have enabled measurements of temperature and species gradients in the reacting zone above a high-temperature material. The laser measurements, which are done with submillimeter spatial resolution, provide a direct, qualitative illustration of surface-catalyzed reaction efficiency when reactive species distributions are compared for different materials. Further analysis of the measured quantities balancing the diffusive reactant flux with the consumption of atoms by surface reactions yields quantitative values for surface-catalyzed reaction rates and catalytic efficiencies. In this work, measurements of oxygen atom distributions in O 2 Ar plasmas are presented for reference materials of high and low catalytic efficiency. The laser measurements are then used to determine values for atomic oxygen recombination to molecular oxygen. Comparisons of the present values of the recombination efficiency ( 0.0317 ± 0.0056 cold copper, 0.0014 ± 0.0002 cold quartz, and 0.0079 ± 0.0012 hot quartz) with previously published data suggest that this technique provides a viable method for characterizing the catalytic behavior of high-temperature materials in plasma test facilities.


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    Title :

    Surface Catalyzed Reaction Efficiencies in Oxygen Plasmas from Laser-Induced Fluorescence Measurements


    Contributors:

    Published in:

    Publication date :

    2016-10-06


    Size :

    11 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English