Patent · US Active

Mass spectrometer ion guide providing axial field, and method

US7868289B2 · kind B2 · utility

12Cited by

34References

25Claims

0Family size

Assignee

Ionics Mass Spectrometry Group, Inc.

Inventors

Lisa Cousins · Vaughan, CA
Gholamreza Javahery · Branford, US
Ilia Tomski · Concord, CA

Key dates

Filing date	Apr 30, 2007
Grant date	Jan 11, 2011
Priority date	—
Expiry date	Mar 10, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH01J49/063
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An ion guide includes a plurality of rods, arranged about an axis that extends lengthwise from one end to the other of the guide. The rods guide ions in a guide region along and about the axis. A conductive casing surrounds the rods. The casing and the rods are geometrically arranged to produce an axial electric field along the axis. Specifically, the geometry is such that a first constant applied DC voltage (UDC), applied to the rods, and a second constant applied DC voltage (UCASE) applied to the casing, produce a voltage gradient between said casing and said axis that has a different magnitude at different positions along said axis.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.