Effects of temperature and clustering on mobility of ions in carbon dioxide (original) (raw)

1989, The Journal of Physical Chemistry

The effects of temperature and clustering on the mobility of ions drifting in C 0 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 O C , about three C02 molecules, on average, clustered around protonated amine core ions. As the temperature was raised, the number of clustered molecules decreased, and above 200 O C , it was practically zero. A clear mass-mobility correlation was observed in the protonated aliphatic amines even at 90 O 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 COz as a drift gas in IMS, although inferior in some cases, should not be precluded.

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