Detectors and ion sources

Details Detectors and ion sources Detectors and ion sources

H - Electricity

01

J

H01J 49/10 (2006.01) H01J 49/16 (2006.01) H01J 49/00 (2006.01)

Patent

CA 2683913

A FAIMS ion mobility spectrometer (1) has an analyte ion source assembly 4 by which an analyte substance is ionized and supplied to the inlet (2) of the spectrometer. The ion source assembly (4) has an upstream source (41) of clean, dry air and two ion sources (43 and 44) of opposite polarity arranged at the same distance along the flow path. The ion sources (43) and (44) are arranged so that the overall charge of the plasma produced is substantially neutral. The analyte substance is admitted via an inlet (61) downstream of the ion sources (43 and 44) and flows into a reaction region (63) of enlarged cross section to slow the flow and increase the time for which the analyte molecules are exposed to the plasma.

L'invention concerne un spectromètre FAIMS de mobilité ionique (1) qui comprend un assemblage de source ionique pour analyte (4) au niveau de laquelle une substance analyte est ionisée et introduite dans l'orifice d'entrée (2) du spectromètre. L'assemblage de source ionique (4) comprend une source en amont (41) d'air propre et sec et deux sources ioniques (43 et 44) de polarité opposée disposées à la même distance le long de la voie d'écoulement. Les sources ioniques (43) et (44) sont disposées de manière à ce que la charge globale du plasma produit soit sensiblement neutre. La substance analyte est admise via un orifice d'entrée (61) en aval des sources ioniques (43 et 44) et s'écoule dans une région de réaction (63) de section élargie afin de ralentir l'écoulement et d'augmenter le temps d'exposition au plasma des molécules d'analyte.

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