In this study, we have measured the negative ion mobility in O₂ at high pressures with a little amount of H₂O concentration between 15 and 17,000 ppb. After that, we carried out a Monte Carlo simulation using mobility of electrons, that of the ions obtained in the measurements, and rate coefficients of ion-molecule reactions. As a result, the mobility value 2.39 cm²/V·s of O₄¯ is obtained in ultrahigh purity O₂ of which the H₂O concentration is between 15 and 100 ppb. Moreover, the mobility decreases with the H₂O concentrations at which the ion species are considered to be O₂¯·(H₂O)_n (_n = 1, 2, 3). Then, we compared the experimental result with that of the simulation and estimated the ion mobility and rate coefficients of ion molecule reactions. Simulation results using estimated values of the ion mobility and rate coefficients agree well with measurement results.

中文翻译：

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少量 H2O 对大气压下 O2 中负离子迁移率和离子-分子反应的影响

在这项研究中，我们测量了高压下O ₂中的负离子迁移率，H ₂ O 浓度在 15 到 17,000 ppb 之间。之后，我们使用电子的迁移率、测量中获得的离子的迁移率以及离子-分子反应的速率系数进行了蒙特卡罗模拟。结果，在H ₂ O浓度在15和100ppb之间的超高纯度O ₂中获得了O _{4的迁移率值2.39 cm} ² /V·s 。此外，迁移率随着 H ₂ O 浓度的增加而降低，此时离子种类被认为是 O ₂ ¯·(H ₂ O) _n（_n  = 1、2、3）。然后，我们将实验结果与模拟结果进行了比较，并估算了离子分子反应的离子迁移率和速率系数。使用离子迁移率和速率系数的估计值的模拟结果与测量结果非常吻合。