Abstract
The effects of temperature and clustering on the mobility of ions drifting in CO{sub 2} at ambient pressure were studied by ion mobility spectrometry (IMS). A semiempirical procedure for obtaining quantitative data on the size of the cluster was applied. At 90{degree}C, about three CO{sub 2} molecules, on average, clustered around protonated amine core ions. As the temperature was raised, the number of clustered molecules decreased, and above 200{degree}C, it was practically zero. A clear mass-mobility correlation was observed in the protonated aliphatic amines even at 90{degree}C. Protonated pyridine, picoline, lutidine, and collidine were unresolved at this temperature, but as the temperature was raised, resolution improved. On the whole, use of CO{sub 2} as a drift gas in IMS, although inferior in some cases, should not be precluded.
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