ION MOBILITY SPECTROMETERS

摘要

An ion mobility spectrometer has a reaction region separated from a drift region by an electroststic gate. A doping circuit supplies a dopant to the reaction region but the drift region is undoped. Two high field ion modifiers are located one after the other in the drift region. One modifier can be turned on to remove dopant adducts from the admitted ions or both can be turned on so that the ions are also fragmented. In this way, several different responses can be produced to provide additional information about the nature of the analyte substance and distinguish from interferents.