We have measured negative ion mobilities at atmospheric pressure, in extremely low E/P0 from 0.019 to 1.8 V/cm•Torr. A cascaded gap, which consists of an ion drift gap and an ion detecting gap, is used for the experiment. The ion detecting gap is formed from positive point plane gap, so-called Geiger Counter. The measurement of the negative ion mobilities is made at atmospheric pressure. An obtained reduced zero field mobility of O-2 is 2.03±0.07cm2/V•s. This value is in good agreement with Snuggs, et al, but slightly smaller than that of Voshall, et al. Another ion mobility was detected for 1.0≤E/P0≥4.0V/cm•Torr region, and we presume that it is the value of negative ion of O3.
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