ION MOBILITY SPECTROMETER Russian patent published in 2008 - IPC H01J49/40 G01N27/62 

FIELD: gas analysis.

SUBSTANCE: ion mobility spectrometer contains the neoformation chamber with installed ion source, drift chamber with the ion collector and aperture mesh, ejecting electrode and the mesh gate which form the ejection area, holes for supplying the mixture of the analised substance with carrier gas, and drifting gas and for outputting the drift gas and the mixture of the analised substance with carrier gas. The chamber of ion-formation with the ion source is placed out of the ejection area and connected with it via adapter with the canal for ion transportation; at that, the ion-formation chamber has the potential of the mesh gate. The adaptor canal has the conical shape, at the ion-formation chamber, which becomes slit-like at the ejection area. The planes of the slit-like canal are parallel to the mesh gate. The length of the slit-like canal is selected so as to guide the ion and carrier gas flow along the ejecting electrode and the mesh gate. The length of the slit-like canal is more or equal to the canal's width, and the canal's width is equal to or less than the distance between the mesh gate and the ejecting electrode.

EFFECT: background current is reduced; sensitivity and resolution of spectrometer are increased.

6 cl, 3 dwg