Electrode for mass spectrometry

Details Electrode for mass spectrometry Electrode for mass spectrometry

2008-04-01

2008-04-01

Berman, Jack I. (Department: 2881)

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

C250S281000

Reexamination Certificate

active

10574569

ABSTRACT:
An electrode for use in a reduced pressure region in a mass spectrometer whereby the electrode is subject to deposition of dielectric (non-conducting) substances thereon, which can cause unstable performance of the mass spectrometer. The surface portion of the electrode that is for providing an equipotential boundary of an electric field for influencing charged particles is made rough, in contrast to the prior art of providing a polished surface. The rough surface provides projections and cavities, which may have a regular or irregular occurrence, which it has been found significantly reduces the deposition of dielectric substances from the charged particles thereon. A preferred structure is for a rod electrode (42) to have a screw thread (44) formed thereon whereby the thread crests (43) along the rod electrode provide projections (43) and the thread roots (45) provide cavities.

REFERENCES:
patent: 3793063 (1974-02-01), Wiley
patent: 5616919 (1997-04-01), Broadbent et al.
patent: 7208729 (2007-04-01), Syms
patent: 2 099 216 (1982-12-01), None
Product description for ELAN DRC-e ICP-MS by Perkin-Elmer SCIEX, introduced in 2003 as per applicant's IDS.
Product description for Elan 9000 found on Perkin Elmer website at : http://las.perkinelmer.com/Catalog/ProductInfoPage.htm? ProductID=N8120536.

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