Abstract
Oxygen atoms recombination at the wall is studied by time-resolved Optical Emission Spectroscopy in a pulsed discharge. In order to observe the atomic oxygen emission after discharge pulse, it is indispensable to re-excite O atoms because the lifetime of O* atoms is short. Here is proposed a technique based on a double pulse excitation. Atomic oxygen, created during the main discharge pulse, is probed in a time after-glow with a diagnostic pulse. This diagnostic pulse is as short as possible to only repopulate the atomic excited states, without significant production of supplementary atoms. The intensities of the emission lines O(3P-3S) at 844.6 nm and O(5P-5S) at 777.4 nm, measured during diagnostic pulse, are observed in the whole time after-glow as a function of delay after main pulse. The decrease of line intensities is related to the recombination of O atoms at the wall. For a “Pyrex” wall at 300 K, the obtained recombination probability γ is 10−3. This value is in agreement with previous results.
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This work was supported by European Community Grant PECO under contract No. CIPA-CT92-4034, by Comenius University under contract No. UK/1590/97 and by Grant Agency SR under contract No. 1/1322/95.
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Veis, P., Cernogora, G. Study of oxygen recombination with a double pulse discharge. Czech J Phys 48, 75–87 (1998). https://doi.org/10.1023/A:1021292330657
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DOI: https://doi.org/10.1023/A:1021292330657