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Two-Photon Laser-Induced Fluorescence O and N Atoms for the Study of Heterogeneous Catalysis in a Diffusion ReactorAdvanced laser-based diagnostics have been developed to examine catalytic effects and atom/surface interactions on thermal protection materials. This study establishes the feasibility of using laser-induced fluorescence for detection of O and N atom loss in a diffusion tube to measure surface catalytic activity. The experimental apparatus is versatile in that it allows fluorescence detection to be used for measuring species selective recombination coefficients as well as diffusion tube and microwave discharge diagnostics. Many of the potential sources of error in measuring atom recombination coefficients by this method have been identified and taken into account. These include scattered light, detector saturation, sample surface cleanliness, reactor design, gas pressure and composition, and selectivity of the laser probe. Recombination coefficients and their associated errors are reported for N and O atoms on a quartz surface at room temperature.
Document ID
20020034927
Acquisition Source
Ames Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Pallix, Joan B.
(Thermoscience Inst. Moffett Field, CA United States)
Copeland, Richard A.
(SRI International Corp. Menlo Park, CA United States)
Arnold, James O.
Date Acquired
August 20, 2013
Publication Date
January 1, 1995
Subject Category
Atomic And Molecular Physics
Funding Number(s)
CONTRACT_GRANT: NAS2-14031
PROJECT: RTOP 242-80-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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