Abstract
Ion mobility spectrometry (IMS) has been used as a technique to separate isomeric ions. A branched protonated C 8H 16O ketone has a higher mobility than its unbranched isomer due to its more compact structure. Protonated CH 3SCN has a lower mobility than protonated CH 3NCS. This is probably due to its higher calculated dipole moment which leads to stronger interactions with the neutral gas through which the ions drift and therefore to slower progress. These examples demonstrate the application of IMS for studies of the structure of gas-phase ions.
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