Relative electron detachment cross sections for the projectiles CH⁻ and ${\mathrm{C}\mathrm{H}}_2^{-}$ colliding with N₂ and O₂ target gases were measured. Two different methods to measure the cross sections were used, the signal growth rate and the beam attenuation. The cross sections measured with the beam attenuation technique were higher than those measured with the signal growth rate method. An analysis based on the differences of the cross sections measured with the two methods showed consistency with the time-dependent processes of metastable auto-detaching state populations undergoing decay as a function of its time of flight. These metastable processes seem to be target dependent. When the target was O₂, a decaying process characterized by a lifetime of the order of 0.40 ± 0.16 μs was found. For the case of the N₂ as a target, it was not possible to derive a characteristic lifetime.

对于弹丸CH相对电子脱离横截面^-和${\mathrm{丙}\mathrm{高}}_2^{-}$测量与 N ₂和 O ₂目标气体的碰撞。使用了两种不同的方法来测量横截面，即信号增长率和光束衰减。使用光束衰减技术测量的横截面高于使用信号增长率方法测量的横截面。基于使用两种方法测量的横截面差异的分析表明，与作为其飞行时间函数衰减的亚稳态自分离态种群的时间相关过程一致。这些亚稳态过程似乎依赖于目标。当目标是 O _{2 时}，发现了一个衰变过程，其特征是寿命约为 0.40 ± 0.16 μs。对于 N _{2 的情况} 作为目标，无法推导出特征寿命。