Effect of the Composition of a Gas Mixture on Determining the Probability of Heterogeneous Recombination of H, O, and N Atoms on Quartz

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Abstract Experimental studies of the processes of the heterogeneous recombination of H, O, and N atoms on quartz at reactor pressures close to atmospheric atmosphere at altitudes of 60 to 70 km are carried out. An experimental setup for determining the effective probability γ of the heterogeneous recombination of atoms using resonance fluorescence spectroscopy (RFS) is described. The technique allows simultaneously, in pairs, recording the concentrations of H, O, and N atoms with a sensitivity of 108 to 1014 particles/cm3. The emphasis is placed on the experimental estimates of the effect of the composition of the gas mixture, temperature, and pressure on the results of determining the probability of recombination on the quartz surface of the sample and the reactor. Experimental data on the probabilities of recombination of N, H, and O atoms on the heated surface of a quartz sample in the temperature range 293–965 K are obtained. Probable mechanisms of the recombination process related to certain surface active centers are proposed. The ranges of the change of activation energies are estimated based on the probabilities of the ongoing recombination processes.

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