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Shock Tube Studies on the Nonequlibrium Electron Affinity Kinetics of Fluorine Atom at High Temperatures
Wang Su*,Cui Jiping,Fan Bincheng,He Yuzhong
Author NameAffiliationE-mail
Wang Su* Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080 suwang@imech.ac.cn 
Cui Jiping Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080  
Fan Bincheng Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080  
He Yuzhong Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080  
Abstract:
To study electron affinity kinetics, a shock tube method was applied, in which the test gas was ionized by a reflected shock wave and subsequently quenched by a strong rarefaction wave. As the quenching speed of 106 K/s was reached, a nonequilibrium ionization recombination process occurred, which was dominated by ion recombination with electrons. A Langmuir electrostatic probe was used to monitor variation in the ion number density at the reflection shock region. The working state of the probe was analyzed, and a correction was introduced for reduction of the probe current due to elastic scattering in the probe sheath. The three body electron affinity rate coefficient of the fluorine atom over the temperature range 1200 to 2200 K in an ambiance of argon gas was directly determined. The temperature dependence of electron affinity rate coefficient was discussed.
Key words:  Electron affinity, Fluorine atom, Langmuir probe, Shock tube
FundProject:
高温非平衡条件下氟原子亲电动力学的激波管研究
王苏*,崔季平,范秉诚,何宇中
摘要:
用激波管方法研究了氟原子亲电动力学.利用反射激波加热获得离子化气体,随后经冷却速度达106 K/s的强稀疏波冷却,离化气体将经历以电子复合为主的非平衡过程.用Langmuir静电探针监测反射激波后离子浓度随时间的演变,分析了探针工作状态,引入了探针鞘层内的弹性散射修正.测定了温度在1200~2200 K以氩气为碰撞第三体的F原子与电子复合速率系数,讨论了温度依赖关系.
关键词:  电子复合  氟原子  Langmuir静电探针  激波管
DOI:10.1088/1674-0068/18/6/897-902
分类号: