High-efficiency electron ionizer for a mass spectrometer array
US6521898B2 · kind B2 · utility
21Cited by
6References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 10, 2001 |
| Grant date | Feb 18, 2003 |
| Priority date | — |
| Expiry date | Jul 10, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention provides an improved electron ionizer for use in a quadrupole mass spectrometer. The improved electron ionizer includes a repeller plate that ejects sample atoms or molecules, an ionizer chamber, a cathode that emits an electron beam into the ionizer chamber, an exit opening for excess electrons to escape, at least one shim plate to collimate said electron beam, extraction apertures, and a plurality of lens elements for focusing the extracted ions onto entrance apertures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.