Direct measurement of mobility for cluster ions K+(H2O) in N2 at room temperature

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Abstract
The mobility of the clustered ion K+(H2O) has been measured in nitrogen at 305 K over the E/N range 5–45 Td, by two methods using a drift tube without mass spectrometer. Nitrogen and water vapor pressures used were 3 to 28 Torr and 2 to 20 mTorr, respectively. It is found that the mobility is constant over the E/N range measured and the zero‐field reduced mobility is 2.17±0.03 cm2/V s. This value is 10.0% lower than the Langevin value. One of the methods provides a new experimental technique for obtaining an isolated arrival time spectrum for clustered ions from a composite one.

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