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The Mobilities of Ions and Cluster Ions Drifting in Polar Gas



J A. de Gouw, M Krishnamurthy, S R. Leone


The mobility of ions drifting in polar gases is explored both theoretically and experimentally. New expermental results are presented for (1) NO+ ions drifting in H2O (the resuced zero-field mobility K0(0) is 0.66+or-}0.07 cm2V-1s-1), (2) H3O+(H6d2^O)3 ions drifting in H2O (K0(0)=0.43+or-}0.06cm2V-1s-1), and (3) NO+(CH3COCH3)nions(n=2,3) drifting in CH3COCH3(K0(0)=0.041+or-}0.010cm2V-1s-1 for n=2 and K0(0)=0.050+or-}0.015cm2V-1s-1 for n=3). A number of theoretical models for ion mobilities in polar gases are described. The models are compared with the avalible experimental data and a resonable agreement is obtained. For larger cluster ions the measured mobilities are considerably smaller than the calculated values. Some possible reasons for the discrepancies are discussed, including momentum transfer outside the capture cross section, dipole-dipole interactions, ligand exchange, inelastic collisions, and the validity of Blanc's law.
Journal of Chemical Physics
No. 14


ion mobility, ion-dipole interaction


de Gouw, J. , Krishnamurthy, M. and Leone, S. (1997), The Mobilities of Ions and Cluster Ions Drifting in Polar Gas, Journal of Chemical Physics (Accessed April 25, 2024)
Created March 31, 1997, Updated October 12, 2021