Patent ID: 8399830
Filing Date: 2013-03-19
Classification: G01N,H01J,Y10T

Abstract:
1. Apparatus for combining field asymmetric ion mobility spectrometry (FAIMS) with an analytical device having an ion source region with a first pressure and a vacuum region having a second pressure less than the first pressure, comprising: a transfer capillary with a bore having a geometric bore inlet cross-section and which transfers gas and ions from the ion source region towards the vacuum region; a FAIMS analyzer located between the ion source region and the transfer capillary and having a geometric outlet cross section that differs from the bore inlet cross section; and a geometric transition region, which is located between the FAIMS analyzer and the transfer capillary and has a shape that provides a smooth transition between the FAIMS analyzer outlet cross section and the bore inlet cross section such that transmission of ions from the ion source region to the vacuum region is maximized.