Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117-5776, USA.
J Chem Phys. 2011 Aug 7;135(5):054306. doi: 10.1063/1.3614471.
The kinetics of electron attachment to CF(3) as a function of temperature (300-600 K) and pressure (0.75-2.5 Torr) were studied by variable electron and neutral density attachment mass spectrometry exploiting dissociative electron attachment to CF(3)Br as a radical source. Attachment occurs through competing dissociative (CF(3) + e(-) → CF(2) + F(-)) and non-dissociative channels (CF(3) + e(-) → CF(3)(-)). The rate constant of the dissociative channel increases strongly with temperature, while that of the non-dissociative channel decreases. The rate constant of the non-dissociative channel increases strongly with pressure, while that of the dissociative channel shows little dependence. The total rate constant of electron attachment increases with temperature and with pressure. The system is analyzed by kinetic modeling in terms of statistical theory in order to understand its properties and to extrapolate to conditions beyond those accessible in the experiment.
通过利用 CF(3)Br 的离解电子俘获作为自由基源来研究 CF(3)作为电子俘获函数的动力学，作为自由基源的温度（300-600 K）和压力（0.75-2.5 托）的函数。附着通过竞争的离解（CF(3) + e(-) → CF(2) + F(-)）和非离解通道（CF(3) + e(-) → CF(3)(-)）发生。离解通道的速率常数随温度强烈增加，而非离解通道的速率常数随温度降低。非离解通道的速率常数随压力强烈增加，而离解通道的速率常数几乎没有依赖性。电子附着的总速率常数随温度和压力而增加。通过统计理论的动力学建模来分析该系统，以便理解其性质并推断出实验中无法达到的条件。
