ION MOBILITY SPECTROMETERS

摘要

An ion mobility spectrometer has a reaction region (5) separated from a d rift region (20) by an electroststic gate (21). A doping circuit (8) supplie s a dopant to the reaction region (5) but the drift region (20) is undoped. Two high field ion modifiers (30 and 31) are located one after the other in the drift region (20). One modifier (30) can be turned on to remove dopant a dducts from the admitted ions or both (30 and 31) can be turned on so that t he 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.