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Reaction Kinetics and Chemical Quasi‐Equilibria of the Ozone Synthesis in Oxygen DC Discharges
Author(s) -
Jacobs H.,
Miethke F.,
Rutscher A.,
Wagner H.E.
Publication year - 1996
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.2150360405
Subject(s) - afterglow , ozone , oxygen , metastability , relaxation (psychology) , materials science , kinetics , direct current , chemical reaction , analytical chemistry (journal) , volumetric flow rate , thermodynamics , atomic physics , chemistry , physics , environmental chemistry , organic chemistry , psychology , social psychology , power (physics) , gamma ray burst , quantum mechanics , astronomy
Abstract The spatial distribution of ozone and of oxygen atoms was studied along the active and the passive zone of a dc discharge (positive column, pressure: p = (4 … 10) · 10 2 Pa, current: I = 2 … 50 mA, flow rate: F = 5 … 100 sccm) in flowing oxygen. The composition of the final output O 2 / O 3 ‐mixture is controlled by relaxation processes in the passive reactor zone. It is affected sensitively by the total number density and the gas temperature in the afterglow. Steady states meaning reversible chemical quasi‐equilibria were observed and analysed extensively. Within a detailed kinetic model the formation of these equilibria can be explained quantitatively. The synthesis to ozone is controlled above all by the metastable O 2 ( a 1 Δg) species, which modify drastically the results for the basic mechanism, considering the O atoms in the 3 P and 1 D states.