氟原子在高温非平衡条件下亲电动力学的实验研究

【作者】 王苏； 崔季平； 何宇中； 范秉诚；

【机构】 中科院力学所高温气体动力学开放与研究实验室；

【摘要】 <正>一.引言 由激波气动加热而产生飞行器表面含氟聚合物材料的烧蚀、解聚,其中的解聚产物氟原子吸附电子反应将改变飞行器周围等离子鞘层中的电子数密更多还原

【Abstract】 To study electron attachment kinetics, a new shock tube method is applied, in which the test gas is ionized by a reflected shock wave and subsequently quenched by a strong rarefaction wave. As the quenching speed of 106 K/s is reached, the attachment is innon-equilibrium state during the process. A Langmuir electrostatic probe is used to monitor the variation of the ion number density at the reflection shock region. The working state of the probe is analyzed, and collision correction at the probe sheath is introduced. At the temperature range 1200 to 2200K and in an ambiance of argon gas, the three-body attachment rate coefficient of fluorine atom and electron is determined: kr(F+e+Ar→F+ Ar) = 1.29×10-12T-6.36 cm6s-1. The temperature dependence of electron attachment rate coefficient is discussed.更多还原