科研之友
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摘要
Oxygen scrambling is observed when a 1:1 mixture of O-16(2) and O-18(2) in nitrogen/helium buffer (total O-2: 5-20%) is treated at atmospheric pressure in a surface discharge plasma reactor. The statistical isotope distribution (O-16(2)/O-18(2)/O-16(18O) = 1:1:2) is achieved with a very low SIE (i.e., the energy per unit volume). This process, implemented by kinetic simulations, is proposed as a chemical probe for the determination of the average O-atom density in atmospheric plasmas. It was found that, within the explored composition range (5-20% O-2 in N-2/He buffer), the average O-atom density increases with SIE, while it decreases with increasing content of O-2 in the gas being treated. In contrast, an opposite trend is observed for ozone production, which increases with the concentration of O-2 in the treated gas. These observations are consistent with the known reaction of O-atoms with O-2 to form ozone, which, at constant total pressure, is expected to favor ozone production as the concentration of O-2 is increased.
- 出版日期2011-9-22
