Effect of the long-range potential on ion mobility measurements
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- Wyttenbach, T., von Helden, G., Batka, J.J. et al. J Am Soc Mass Spectrom (1997) 8: 275. doi:10.1016/S1044-0305(96)00236-X
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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 C60+, 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.