Patent ID: 9134272
Filing Date: 2015-09-15
Classification: G01N,H01J

Abstract:
1. An ion mobility spectrometer for detection of analyte which comprises: a sample inlet for continuously receiving a flow of sample gas wherein the volumetric flow of sample gas is greater than 85 cm an ionization region for formation of primary ions which comprises an ion source, wherein the ionization volume of the ionization source is greater than 5 cm a reaction region for receiving the flow of sample gas and primary ions, wherein primary ions charge transfer to generate secondary and tertiary ions including analyte ions; an ion shutter; a drift region having an electric field gradient; and an ion detector; wherein the ion shutter gates the entrance of ions into the drift region, the ions in the drift region drift in the electric field gradient in the direction of electrophoresis at the velocity of ion electrophoresis to be detected at the ion detector, thereby allowing detection of analyte, and wherein the linear flow velocity of sample gas in the direction perpendicular to the direction of ion electrophoresis is less than 20% of the velocity [of the velocity] of ion electrophoresis.