Ion separation using ion shutters, in particular devices and methods for IMS

摘要

This disclosure relates to methods and apparatus for ion separation using, for example, time of flight and ion mobility spectroscopy. An ion shutter for use in an IMS cell and a method of operating it is also disclosed. The shutter includes a first shutter electrode and a second shutter electrode. The barrier voltage between these two electrodes is controlled to open and close the shutter so that the ions of interest pass through the shutter in the drift direction. (A) the voltage of the first shutter electrode; And (b) varying both the voltage of the second shutter electrode.