Effect of the long-range potential on ion mobility measurements |
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Authors: | Thomas Wyttenbach Gert von Helden Joseph J Batka Douglas Carlat Michael T Bowers |
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Institution: | 1. Department of Chemistry, University of California, Santa Barbara, California, USA
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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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