Abstract

We precisely measured the electrical mobilities of C60 negative ions (1.0 nm in outer diameter) using a differential mobility analyzer in helium, neon, argon, and krypton at pressures ranging from 1.07×104 to 4.40×104 Pa. The measured inverse mobilities were larger than those calculated from the hard-sphere collision model. We proposed a formula describing the relation between the electrical mobilities and the diameter of C60 ions in such noble gases, which compensates for the deviation from the hard-sphere collision model.

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