Patent ID: 6806466
Filing Date: 2004-10-19
Classification: G01N

Abstract:
An apparatus for separating ions, comprising a high field asymmetric waveform ion mobility spectrometer, including:a) an analyzer region comprising: a first electrode, a second electrode and a third electrode in a spaced apart stacked arrangement for allowing ion flow therebetween, the first electrode having a first inner surface, the second electrode having a first and a second surface on opposite sides thereof, the third electrode having a second inner surface; and, at least a contact on at least one of the first, second and third electrodes, for receiving a compensation voltage potential between the second and first electrodes and between the second and third electrodes, and for applying an asymmetric waveform to at least one of the electrodes, wherein, in use, ions exiting from between the electrodes are other than attracted to the second electrode to collide therewith.