Curtain gas filter for mass- and mobility-analyzers that excludes ion-source gases and ions of high mobility

Patent metadata

Field	Value
Publication number	US-8969795-B2
Application number	US-200913121065-A
Country	US
Kind code	B2
Filing date	Sep 17, 2009
Priority date	Oct 6, 2008
Publication date	Mar 3, 2015
Grant date	Mar 3, 2015

Abstract

A filter for a mass- or mobility-spectrometer that bars gases or vapors of a high-pressure ion source, as well as ions of high mobility and charged droplets, from entering an evacuated mass spectrometer or a mobility spectrometer at a lower pressure than the filter. The buffer gas of the high pressure ion source is blown into the volume of this filter directly or through tubes from where buffer gas and embedded ions are sucked through the aperture of a diaphragm or through an aperture of a capillary mainly from an “extraction volume” filled with a separately supplied clean gas, into which ions of interest are pushed by electric fields formed by electrodes that are substantially rotational symmetric around the “extraction volume” and a substantially flat electrode with respect to an axis of ion extraction and the end of the capillary and the end of a coaxial tube surrounding the capillary.

First claim

What is claimed is:

1. A spectrometry system, comprising:
at least one ion source that operates at an elevated pressure;
at least one spectrometer, comprising at least one of a mass spectrometer and a mobility spectrometer;
a curtain gas filter positioned upstream of said at least one spectrometer, said at least one spectrometer having a lower pressure than a pressure of a main volume of said filter; and
a passage comprising at least one of a diaphragm and a capillary, place…

Assignees

• Wollnik Hermann
• Tarassov Alexander
• Eiceman Gary A
• Shimadzu Corp

Inventors

• Wollnik Hermann
• Tarassov Alexander
• Eiceman Gary A

Classifications

• H01J49/0422 Primary

  Electricity · mapped topic

• H01J49/10

  Electricity · mapped topic