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Effect of the long-range potential on ion mobility measurements

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Journal of the American Society for Mass Spectrometry

Abstract

The temperature dependence of ion mobilities in helium was studied by using the ion chromatography method to investigate the effect of long-range terms in the ion-buffer gas interaction. Experimental cross sections thus determined increased significantly as the temperature was lowered from 300 to 80 K for all ions investigated, which were fullerene C +60 , cationized PEG polymers, cationized crown ethers, and protonated and sodiated oligoglycines. The temperature dependence of the collision cross sections was successfully modeled by employing simple atom-atom interaction potentials including a repulsive R −12 term and the attractive long-range R −6 and R −4 terms, R being the distance between the colliding particles.

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Authors and Affiliations

  1. Department of Chemistry, University of California, Santa Barbara, California, USA

    Thomas Wyttenbach, Gert von Helden, Joseph J. Batka, Douglas Carlat & Michael T. Bowers

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  1. Thomas Wyttenbach
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  2. Gert von Helden
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  3. Joseph J. Batka
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  4. Douglas Carlat
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  5. Michael T. Bowers
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Wyttenbach, T., von Helden, G., Batka, J.J. et al. Effect of the long-range potential on ion mobility measurements. J Am Soc Mass Spectrom 8, 275–282 (1997). https://doi.org/10.1016/S1044-0305(96)00236-X

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  • DOI: https://doi.org/10.1016/S1044-0305(96)00236-X

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