Accession Number : AD0456624

Title :   MISSION ORIENTED INVESTIGATION AND EXPERIMENTATION - GASEOUS DISCHARGE.

Descriptive Note : Semiannual technical rept., 1 Jul-30 Sep 64,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA

Personal Author(s) : Cohen, Norman ; Heicklen, Julian P. ; Carson, Bernard H.

Report Date : 30 JAN 1965

Pagination or Media Count : 13

Abstract : A new technique for measuring the catalytic efficiency of surfaces for atom recombination was developed. It is based on measuring the heat of atom recombination on the surface of small spherical thermistors. Extensive measurements of catalytic heat transfer to these spheres were made. Existing analyses were verified by these data, and important considerations in the design of any experiment to study rarefaction effects were uncovered. An independent measurement of the O-O2 diffusion coefficient was obtained. The technique is well suited for studying the effects of surface temperature on the catalytic efficiency of materials. Results for the Pt-O atom system are reported. In a flow system, CF4 was passed through an electrodeless discharge to produce CF2 radicals. Ethylene, which was injected downstream of the discharge, reacted completely with the CF2 radicals present to produce C3 compounds in a chemiluminescent reaction. Thus, the CF2 concentration could be monitored both optically and chemically as the mixture flowed down the glow tube. The value of the combination rate constant was estimated to be 10 to the 8th power liter/mole-sec. (Author)

Descriptors :   (*GAS DISCHARGES, RECOMBINATION REACTIONS), (*RECOMBINATION REACTIONS, SURFACES), (*REACTION KINETICS, RECOMBINATION REACTIONS), FREE RADICALS, OXYGEN, HALOGENATED HYDROCARBONS, FLUORIDES, ALKENES, PLATINUM, HEAT TRANSFER, CATALYSIS, CATALYSTS, DIFFUSION, LUMINESCENCE, BOUNDARY LAYER, DISSOCIATION, HYPERSONIC FLOW, ABLATION, REENTRY VEHICLES, THERMISTORS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE