We report data of the O2− ion mobility in neon gas over broad density and temperature ranges along with its theoretical description in terms of the thermodynamic, free volume model that has successfully been adopted for the interpretation of electron and ion mobility in superfluid and normal helium. The free volume model, which is aimed at computing the free volume accessible for the ion motion, along with the Millikan-Cunningham slip factor correction, is able to describe the ion mobility in the crossover region connecting the dilute gas regime described by the classical kinetic theory to the high density region ruled by the laws of hydrodynamic transport.

中文翻译：

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O2 − 离子在浓 Ne 气体中的迁移率：自由体积模型

我们报告了在宽密度和温度范围内氖气中 O2− 离子迁移率的数据及其根据热力学、自由体积模型的理论描述，该模型已成功用于解释超流体和普通氦中的电子和离子迁移率. 自由体积模型旨在计算离子运动可获得的自由体积，连同 Millikan-Cunningham 滑移因子校正，能够描述连接经典动力学描述的稀释气体状态的交叉区域中的离子迁移率由流体动力传输定律支配的高密度区域的理论。