Anion formation by electron impact from CF4

Anion formation by electron impact from CF4 has been studied experimentally in the range 0–30 eV electron energy. F− and CF3− anions were observed while F2− ions, if any, were below the detection limit. The resonance peaks for F− and CF3− were measured to be 6.5 and 7.1 eV, respectively. Only F− is produced via the ion pair formation channel and the yield varies monotonically with energy above the threshold.