Measurements of temperature and species gradients in the thermal boundary layer adjacent to different surfaces exposed to nitrogen plasma are made to characterize surface-catalyzed recombination. Laser-induced nitrogen atom fluorescence signals are obtained with submillimeter spatial resolution to provide a direct indication of surface-catalyzed reactivity. Further analysis of the measured quantities balancing the diffusive reactant flux with the consumption of atoms by surface reaction yields direct quantitative values for surface-catalyzed reaction rates and catalytic efficiencies. Materials tested in the present work include metals and quartz, and the surface-catalyzed recombination efficiencies are ( 8.05 ± 2.01 ) × 10 3 , ( 5.74 ± 1.44 ) × 10 3 , ( 2.10 ± 0.53 ) × 10 3 , and ( 1.03 ± 0.26 ) × 10 4 for polished copper, cooled virgin nickel, unpolished copper, and cooled quartz, respectively. Comparisons between these values and previously published results suggest that this technique provides a useful means to characterize the catalytic behavior of high-temperature materials in plasma test facilities.


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    Title :

    Nitrogen Surface Catalyzed Recombination Efficiency from Two-Photon Laser Induced Fluorescence Measurements


    Contributors:

    Published in:

    Publication date :

    2018-07-30


    Size :

    11 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English