Physics
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.8543b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Oct. 20, 1983, p. 8543-8549. USAF-supported research.
Physics
9
Jupiter, Atmosphere, Photochemistry, Phosphine, Ammonia, Chemistry, Interaction, Production Rates, Stratosphere, Temperature, Photolysis, Decomposition, Formation, Techniques, Pressure, Intensity, Models, Theoretical Studies, Parameters
Scientific paper
The rate constant is measured over the temperature interval 218-456 K using the technique of flash photolysis-laser-induced fluorescence. NH2 radicals are produced by the flash photolysis of ammonia highly diluted in argon, and the decay of fluorescent NH2 photons is measured by multiscaling techniques. For each of the five temperatures employed in the study, the results are shown to be indepenent of variations in PH3 concentration, total pressure (argon), and flash intensity. It is found that the rate constant results are best represented for T between 218 and 456 K by the expression k = (1.52 + or - 0.16) x 10 to the -12th exp(-928 + or - 56/T) cu cm per molecule per sec; the error quoted is 1 standard deviation. This is the first determination of the rate constant for the reaction NH2 + PH3. The data are compared with an estimate made in order to explain results of the radiolysis of NH3-PH3 mixtures. The Arrhenius parameters determined here for NH2 + PH3 are then contrasted with those for the corresponding reactions of H and OH with PH3.
Bosco S. R.
Brobst W. D.
Nava David F.
Stief Louis J.
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