Abstract
Mobilities of singly and doubly charged ions of neon, argon, krypton, and xenon in helium and of xenon in neon have been determined in a drift-tube mass-spectrometer apparatus at temperatures near 300 K and for $10\ensuremath{\le}\frac{E}{N}\ensuremath{\le}100$ Td. The zero-field reduced mobility of a given doubly charged ion is found to be either equal to or slightly smaller than that of its singly charged counterpart. However, the dependences of the mobilities on $\frac{E}{N}$ are found to be strikingly different for the two cases. No difference in mobility is observed between doubly charged ions in the low-lying, metastable states and in their ground state, in contrast to the case of the ions drifting in their parent gases.
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