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Laser induced photo-detachment of O2 in DC discharge
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作者 j r legorreta j l patino f b yousif 《Plasma Science and Technology》 SCIE EI CAS CSCD 2018年第7期98-105,共8页
Determination of the negative ion number density of O2 and O in a DC discharge of oxygen plasma was made employing Langmuir probe in conjunction with eclipse laser photo- detachment technique. The temporal evolution o... Determination of the negative ion number density of O2 and O in a DC discharge of oxygen plasma was made employing Langmuir probe in conjunction with eclipse laser photo- detachment technique. The temporal evolution of the extra electrons resulting from the photo- detachment of O2- and O- were used to evaluate the negative ion number density. The ratio of O2 number density to O varied from 0.03 to 0.22. Number density of both O~ and O increased with increasing power and decreased as the pressure was increased. Electron number density was evaluated from the electron energy distribution function (EEDF) using the I-V recorded characteristic curves. Electron temperature between 2 and 2.7 eV were obtained. Influence of the 02(al△g) metastable state is discussed. 展开更多
关键词 electronegative plasma electron temperature Langmuir probe negative ion number density
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