Mass spectrometer
US6423965B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1999 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | Aug 23, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Plasma ion source mass spectrometers or liquid chromatograph/mass spectrometers are provided: wherein photon noises and matrix molecule ions produced by the ion source are decreased, the decrease of the quantity of signal is suppressed, and the apparatus maintenance is improved. The photon noises are decreased with a shielding plate and a 90 degrees deflector. The maintainability in cleaning is improved by a combination of a leading electrode, the shielding plate having a small hole, and a gate valve. The decrease in the quantity of signal is suppressed with the leading electrode, and a double cylindrical type static lens. Position adjustment of the leading electrode is performed with a flat plate having plural holes. Using an ion trap mass analyzer, matrix molecule ions are eliminated by applying a resonance voltage between its end cap electrodes. Decrease in the quantity of signals, which has been a problem, can be prevented, and a high transmission can be realized with a preferable reproducibility against disturbance of an electric field caused by ion lens and the like. A detectable limit of atomic ions of the sample can be improved by eliminating the matrix molecule ions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.