ION MOBILITY SYSTEM COMPRISING TWO IMS CELLS OPERATED AT DIFFERENT POLARITIES

摘要

An ion mobility spectrometer system includes two cells (1) and (2) driven by a
drive unit (12) so that the cells operate at opposite polarities and are
switched between different polarities either at regular intervals or in
response to detection of a substance in one cell. Two reagents are supplied to
both cells (1) and (2), one promoting detection of a substance in the positive
mode and the other promoting detection of a substance in the negative mode so
that there is no need to switch reagents when the polarity changes.