Curtain gas filter for high-flux ion sources
US8809775B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 10, 2010 |
| Grant date | Aug 19, 2014 |
| Priority date | — |
| Expiry date | Aug 10, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/0445
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A curtain-gas filter for a mass- or mobility-spectrometer that bars gases or vapors of a high-flux atmospheric pressure ion source, as we ions of high mobility and charged droplets, from entering an evacuated mass spectrometer or a mobility spectrometer that is at a lower pressure than the main filter volume of the curtain-gas filter. A portion of the ion-source buffer gas in the ion-source plume is sucked through an ion-source buffer gas inlet into the main filter volume of the curtain-gas filter, from where this ion-source gas is exhausted after a properly shaped electric field has pushed a large portion of the embedded ions into an externally provided stream of a clean buffer gas, which is sucked through a passage into a mass- or mobility-spectrometer that is at a lower pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.