Measured and calculated mobilities of cluster ions drifting in helium and in nitrogen

de Gouw, Joost A. ; Krishnamurthy, M. ; Bierbaum, Veronica M. ; Leone, Stephen R. (1997) Measured and calculated mobilities of cluster ions drifting in helium and in nitrogen International Journal of Mass Spectrometry and Ion Processes, 167 . pp. 281-289. ISSN 0168-1176

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New experimental results are presented for the mobilities of (1) the H3O+(H2O)3 cluster ion drifting in He (the reduced zero-field mobility K0(0) is 11.5 ± 0.4 cm2 V−1 s−1, (2) NO+ (CH3COCH3)n cluster ions drifting in He (K0(0) = 7.5 ± 0.4 cm2 V−1 s−1 for n = 2, K0(0) = 7.3 ± 0.5 cm2 V−1 s−1 for n = 3) and (3) the NO+(CH3CN)2 cluster ion drifting in N2 (K0(0)) = 1.70 ± 0.06 cm3 V−1 s−1). These results together with other recently reported cluster ion mobilities in He are quantitatively explained using the hard-sphere collision model by von Helden et al. (J. Phys. Chem. 97 (1993) 8182–8192). The role of ion-induced dipole interactions is investigated and shown to be minor for the mobilities of all but the smallest ions in He. The existing data on cluster-ion mobilities in N2, including the result here, are systematized. As a result of the stronger polarizability of N2, the hard-sphere collision model does not agree with the data, and a better explanation is obtained using a simple model that includes ion-induced dipole interactions. The size of the cluster has only a minor effect on the mobility in N2. The remaining discrepancies between the measured and calculated results are attributed to ion-quadrupole or dipole induced-dipole interactions.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Ion; Mobility; Cluster; Drift Tube
ID Code:102626
Deposited On:02 Feb 2018 04:37
Last Modified:02 Feb 2018 04:37

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