ISSN:
1572-8986
Keywords:
Oxygen discharge
;
degree of dissociation
;
ozone
;
Wrede-Harteck method
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Technology
Notes:
Abstract The degree of dissociation of oxygen has been measured in the positive column plasma of a glow discharge by two different methods (the ozone method and the Wrede-Harteck method). The results of both methods are in a good agreement. The pressure was varied from 66 to 266 Pa, the discharge current from 4 to 100 mA, and the discharge tube was of 2.0 cm inside diameter. As expected, the degree of dissociation increases with increasing discharge current and decreases with increasing pressure. Calculations of the degree of dissociation show that the main loss process of the oxygen atoms is caused by the recombination on the wall of the discharge tube for pressures up to several 100 Pa. We found that the value of the recombination coefficient for the glass wall of the discharge tube (γ≈4.6·10−4) is about a factor 2 larger than that for a tube outside of the discharge (γ≈2.2·10−4). Ozone processes, including metastable oxygen molecules, have increasing influence on the balance of the oxygen atoms as the pressure increases.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00567910
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